swift

bbf3a589 - [cxx-interop] Do not pass `-tools-directory` in tests

[cxx-interop] Do not pass `-tools-directory` in tests ClangImporter is now able to find the C++ stdlib on its own, let's not provide any explicit options that control this in tests. rdar://119869070 (cherry picked from commit 4979879d254b3862b655161598a7d0ccd3057b52)