Have the configure script put llvm.py into the object root.

Have the configure script put llvm.py into the object root.
The QMTest program can then use that as the location for loading test and
resource class, thus compiling the Python code into the object root as
desired.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8551 91177308-0d34-0410-b5e6-96231b3b80d8