Summary:
Occasionally you need an include or similar things to be configured
when making a new testcase. Allow passing these to the script and down to the
compiler calls.
Reviewers: grosser, Meinersbur, bollu
Reviewed By: Meinersbur
Subscribers: bollu, llvm-commits, pollydev
Differential Revision: https://reviews.llvm.org/D46359
llvm-svn: 331364