Temporary fix broken build.ninja after r253790.

Temporary fix broken build.ninja after r253790.

FIXME: This can be reverted several hours later.

r253790 introduced cyclic deps around llvm-tblgen and it was affecting after reverting.

  ninja: error: dependency cycle: include/llvm/IR/Attributes.inc -> include/llvm/IR/Attributes.inc.tmp -> bin/llvm-tblgen -> utils/TableGen/CMakeFiles/obj.llvm-tblgen.dir/DFAPacketizerEmitter.cpp.o -> include/llvm/IR/Attributes.inc

It may be a ninja's bug.

FYI, renaming DFAPacketizerEmitter.cpp would be useless.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@253810 91177308-0d34-0410-b5e6-96231b3b80d8