Create clang/test/Driver/lit.local.cfg.

These files had been ignored.

  - clang_f_opts.h
  - debug-comp-dir.S
  - debug-main-file.S

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173416 91177308-0d34-0410-b5e6-96231b3b80d8