For PR351:
* Place a try/catch block around the entire tool to Make sure std::string
  exceptions are caught and printed before exiting the tool.
* Make sure we catch unhandled exceptions at the top level so that we don't
  abort with a useless message but indicate than an unhandled exception was
  generated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19192 91177308-0d34-0410-b5e6-96231b3b80d8

Fix MINGW compilation errors

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19190 91177308-0d34-0410-b5e6-96231b3b80d8

* Fix a bug in an m4 macro that used an incorrect test operator
* Add CAN_DLOPEN_SELF so we can determine if dlopen(0) will open the
  program or not.
* Correct a warning messages to be a little more specific on what it checks

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19184 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a Bourne Shell syntax error in a test

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19183 91177308-0d34-0410-b5e6-96231b3b80d8

Fix one of the names to not have a . in front of it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19182 91177308-0d34-0410-b5e6-96231b3b80d8

Bug fixed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19181 91177308-0d34-0410-b5e6-96231b3b80d8

Fix PR491 and testcase Transforms/DeadStoreElimination/2004-12-28-PartialStore.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19180 91177308-0d34-0410-b5e6-96231b3b80d8

Add a comment, add a new testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19179 91177308-0d34-0410-b5e6-96231b3b80d8

New testcase for PR491

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19178 91177308-0d34-0410-b5e6-96231b3b80d8

Bug fixed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19177 91177308-0d34-0410-b5e6-96231b3b80d8

Fix PR490
Fix testcase CodeGen/CBackend/2004-12-28-LogicalConstantExprs.ll

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19176 91177308-0d34-0410-b5e6-96231b3b80d8

new testcase for PR490

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19175 91177308-0d34-0410-b5e6-96231b3b80d8

XFAIL this test everywhere.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19174 91177308-0d34-0410-b5e6-96231b3b80d8

XFAIL this everywhere, the CFE doesn't support bitfield initialization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19173 91177308-0d34-0410-b5e6-96231b3b80d8

Remove potential platform portability issue with size of "int".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19172 91177308-0d34-0410-b5e6-96231b3b80d8

Correct the name of the variable for the LLVM examples directory so that
parallel builds don't attempt to create it twice.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19171 91177308-0d34-0410-b5e6-96231b3b80d8

Make the x86_64 target names match between def and use. Thanks Misha.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19170 91177308-0d34-0410-b5e6-96231b3b80d8

Make the 64-bit x86 target named "x86_64" instead of "AMD64".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19169 91177308-0d34-0410-b5e6-96231b3b80d8

Add a note about registering the backend so it's available in LLC and LLI

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19168 91177308-0d34-0410-b5e6-96231b3b80d8

Bring VS projects up to date with respect to recent changes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19167 91177308-0d34-0410-b5e6-96231b3b80d8

Don't create symbolic links for lib/System any more. It doesn't need them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19166 91177308-0d34-0410-b5e6-96231b3b80d8

Clean up some autoconf cruft
* Make the source detection use a file unique to Stacker
* Configure Makefile.common.in with AC_CONFIG_FILES not AC_CONFIG_MAKEFILE
* Use new autoconf format for invoking AC_OUTPUT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19165 91177308-0d34-0410-b5e6-96231b3b80d8

Make it possible to reconfigure a project as well as just LLVM main dir.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19164 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a bug that made the nightly tester *really* slow. During changes for
portability, the --track-space option was inadvertently ignored. This patch
fixes that so that sys::Process::GetMallocUsage() is only invoked if the
--track-spaces option is given. Apparently the mallinfo() call that
GetMallocUsage() uses is *very* slow, especially when processing very large
modules like projects/llvm-test/MultiSource/Applications/kimwitu++.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19163 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* sys::PreventCoreFiles -> sys::Process::PreventCoreFiles

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19162 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Ensure #includes are wrapped with appropriate HAVE_ guards
* Account for variations in time.h and sys/time.h inclusion.
* Add macros for getting wait(2) exit status correctly (per autoconf sugg.)
* Implement ThrowErrno in terms of strerror_r, strerror or none based on
  what is available on the platform.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19161 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Remove redundant #includes that are now in Unix.h

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19160 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Move implementation of sys::PreventCoreFiles function to this file from
  the now defunct SysConfig abstraction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19159 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Ensure #includes are wrapped with appropriate HAVE_ guards
* Ensure variations in "dirent" structure are accounted for.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19158 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Ensure #includes are wrapped with appropriate HAVE_ guards
* Consolidate implementation from operating system specific directory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19157 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Ensure #includes are wrapped with appropriate HAVE_ guards

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19156 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/TimeValue.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19155 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/Program.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19154 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/Signals.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19153 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/Memory.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19152 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/MappedFile.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19151 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Consolidate implementation for Unix systems into Unix/Process.cpp
* Avoid use of symbolic link to #include platform-specific implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19150 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
SysConf abstraction was pointless because it had a single function in it that
pertained only to the current process. So merge it into the Process abstraction
and remove the files completely.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19149 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Add checks for sterror and strerror_r functions
* Add check to determine if /dev/zero is needed for allocating RWX memory.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19148 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Provide a check to determine if /dev/zero is needed for AllocateRWX function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19147 91177308-0d34-0410-b5e6-96231b3b80d8

Oops, reverse the logic on a test for WITH_LLVMGCCDIR to make it define
the path names correctly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19146 91177308-0d34-0410-b5e6-96231b3b80d8

Provide a value for HAVE_MMAP_ANONYMOUS variable, for consistency with
other #define's.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19145 91177308-0d34-0410-b5e6-96231b3b80d8

Describe the --with-llvmgccdir option to configure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19144 91177308-0d34-0410-b5e6-96231b3b80d8

Revert the last patch so that the LLVMGCCDIR environment variable is
still viable and will make use of the resurrected --with-llvmgccdir
configure option.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19143 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
* Make sure all headers used by lib/System have checks
* Use "standard" autoconf checks for certain problematic headers
For PR432:
* Resurrect --with-llvmgccdir so a specific llvm-gcc/llvm-g++ installation
  can be specified.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19142 91177308-0d34-0410-b5e6-96231b3b80d8

mingw doesn't support the official debug API.

Old versions of the C runtime somehow get loaded into the process.  Make
sure they aren't searched for symbols.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19141 91177308-0d34-0410-b5e6-96231b3b80d8

Get VC++ building again

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19140 91177308-0d34-0410-b5e6-96231b3b80d8

Ignore the autom4te.cache directoy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19139 91177308-0d34-0410-b5e6-96231b3b80d8

Make sure llvm-g++ gets the right path for the llvm tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19138 91177308-0d34-0410-b5e6-96231b3b80d8

Eliminate use of ltdl.c when doing a VC++ build.  Because libtool isn't used,
ltdl's LGPL license would infect all of LLVM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19137 91177308-0d34-0410-b5e6-96231b3b80d8

Make the symbolic link using the correct variable!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19136 91177308-0d34-0410-b5e6-96231b3b80d8

Remove references to LLVMGCCDIR because it was only used to provide a
value for the --with-llvmgccdir configure option which is no longer
supported.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19135 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Merge implementations of isValid and GetTemporaryDirectory into this file. There
is not any point having the operating system specific files for such little
variation between the Unix family of systems.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19134 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
This implementation is no longer needed, its been merged to Unix/Path.cpp since
there is such little variation between the platforms.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19133 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Use the LLVM_ON_UNIX and LLVM_ON_WIN32 #defines to include the implementation
instead of relying upon the "platform" link

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19132 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Create new variables LLVM_ON_UNIX and LLVM_ON_WIN32 so we can start getting
rid of reliance upon a symbolic link to switch implementations in lib/System

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19131 91177308-0d34-0410-b5e6-96231b3b80d8

Resurrect this file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19130 91177308-0d34-0410-b5e6-96231b3b80d8

Remove these files as they are not being included any more. DynamicLibrary
is now implemented via ltdl.cpp which has its own way of dealing with
the different platforms.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19129 91177308-0d34-0410-b5e6-96231b3b80d8

Make sure LLVMGCCWITHPATH is used instead of just LLVMGCC so that the
CFE tools can find the correct LLVM tools to invoke.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19128 91177308-0d34-0410-b5e6-96231b3b80d8

The dejagnu scripts need a path for llvm-gcc/llvm-g++ as well so use the
correct variable to get a "set the path first" invocation of those tools.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19127 91177308-0d34-0410-b5e6-96231b3b80d8

Two corrections:
* When reconfiguring, make sure the config.cache file is blown away so that
  its (old) values don't short-circuit doing the tests. When a reconfigure
  is done, it should be done from scratch, without the cache.
* For dist-check, don't pass --with-llvmgccdir any more because configure
  doesn't have this option any more.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19126 91177308-0d34-0410-b5e6-96231b3b80d8

Change llvmgcc/llvmg++ to llvm-gcc and llvm-g++ respectively.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19125 91177308-0d34-0410-b5e6-96231b3b80d8

Fix VC++ compilation error

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19124 91177308-0d34-0410-b5e6-96231b3b80d8

Fix a bug in libtool's ltmain.sh. On Cygwin the "$output.exp" expression
expands to a full path name. Substitute $outputname.exp" instead and it
makes a viable temporary file name. This gets around the problem with lli
on Cygwin linking but not having any "C" library functions linked into it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19123 91177308-0d34-0410-b5e6-96231b3b80d8

Put CopyFile in the sys namespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19122 91177308-0d34-0410-b5e6-96231b3b80d8

Wrap at 80 cols

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19121 91177308-0d34-0410-b5e6-96231b3b80d8

Correct the comments and file header.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19120 91177308-0d34-0410-b5e6-96231b3b80d8

Try to speed up gccld hot spot in BasicVN::getEqualNumberNodes by making
a function call at the core of the loop inline and removing unused
stack variables from an often called function. This doesn't improve things
much, the real saving will be by reducing the number of calls to this
function (100K+ when linking kimwitu++).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19119 91177308-0d34-0410-b5e6-96231b3b80d8

Update the amd64 target detection checks.
Patch contributed by Markus F.X.J. Oberhumer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19118 91177308-0d34-0410-b5e6-96231b3b80d8

Add a caution about using experimental versions of gnu binutils when
building Cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19117 91177308-0d34-0410-b5e6-96231b3b80d8

Be specific about version of GCC and binutils on Cygwin since it matters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19116 91177308-0d34-0410-b5e6-96231b3b80d8

LLVM now builds and runs on Linux/amd64, but we don't have 64-bit codegen yet

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19115 91177308-0d34-0410-b5e6-96231b3b80d8

Allow llc to recognize -march=x86.  As it was, it didn't recognize any
architecture at all.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19114 91177308-0d34-0410-b5e6-96231b3b80d8

Added support for detection of amd64 targets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19113 91177308-0d34-0410-b5e6-96231b3b80d8

Patch to fix mingw compilation problem contributed by Henrik.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19112 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the build on PowerPC/Darwin - it thought we were declaring a new
function or something. Since FileRemover takes a const reference to
sys::Path, we need to pass an actual sys::Path variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19111 91177308-0d34-0410-b5e6-96231b3b80d8

* Remove an unnecessary step.
* Correct a path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19110 91177308-0d34-0410-b5e6-96231b3b80d8

Correct compilation for Cygwin. FindExecutable now returns a sys::Path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19109 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Include local FDHandle.h file now that FDHandle is local to this library
and not in lib/System/FileUtilities.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19108 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
FDHandle class (non-portable) moved here from lib/Support/FileUtilities

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19107 91177308-0d34-0410-b5e6-96231b3b80d8

For PR351:
Move non-portable FDHandle class to its only user: lib/Debugger

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19106 91177308-0d34-0410-b5e6-96231b3b80d8

Add a blurb about using the GCC 3.4.3 compiler on Cygwin (which works) for
the CFE instead of the default GCC 3.3.3 compiler that comes with Cygwin.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19104 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Remove the idiotic windows environment setting, its not needed.
* Remove an extraneous "mkdir" instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19103 91177308-0d34-0410-b5e6-96231b3b80d8

Hopefully fix a link.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19102 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the names of these executables now that they've been somewhat cast in
stone.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19101 91177308-0d34-0410-b5e6-96231b3b80d8

Correct the name of the executables to which llvmgcc and llvmgxx variables
point to.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19100 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
Rework the CFE build details to include the directions for using the
option --program-prefix=llvm- to the CFE's configure script. This ensures
that the CFE builds unique executable names and makes it possible to put
the $CFEINSTALL/bin directory into one's path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19099 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* llvmgcc -> llvm-gcc
* llvmg++ -> llvm-g++
* remove references to --with-llvmgccdir configure option

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19098 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Use LLVMGCC and LLVMGXX variables instead of computing the name

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19097 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Variable name change: cferuntime_libdir -> CFERuntimeLibDir

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19096 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Cleanup LLVMGCXX and LLVMGCC by providing LLVMGXXWITHPATH and LLVMGCCWITHPATH
  variables that add the $(LLVMToolDir) to the path so the CFE tools can find
  the right LLVM tools they depend on.
* Standardize the name of a variable: cferuntime_libdir -> CFERuntimeLibDir

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19095 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Use new configuration variables to compute LLVMGCC and LLVMGXX variables.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19094 91177308-0d34-0410-b5e6-96231b3b80d8

For PR432:
* Remove --with-llvmgccdir, not needed any more
* Search path for llvm-gcc and llvm-gxx
* Compute LLVMGCCDIR based on install path of llvm-gcc

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19093 91177308-0d34-0410-b5e6-96231b3b80d8

Get rid of old automake stuff

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19092 91177308-0d34-0410-b5e6-96231b3b80d8

Support the gas option --traditional-format which, for some reason, gets
passed to gccas when the --program-prefix option is used to configure CFE.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19091 91177308-0d34-0410-b5e6-96231b3b80d8

Ignore generated files

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19090 91177308-0d34-0410-b5e6-96231b3b80d8

Revert last patch until we can figure out how to build executables named
llvmgcc and llvmg++ correctly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19089 91177308-0d34-0410-b5e6-96231b3b80d8

Fix the Win32 build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19088 91177308-0d34-0410-b5e6-96231b3b80d8

Revert last changes as they introduce CFE build problems.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19087 91177308-0d34-0410-b5e6-96231b3b80d8

Make parameters to CopyFile use explicit instantiation of sys::Path.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19086 91177308-0d34-0410-b5e6-96231b3b80d8