[libcxx-commits] [libcxx] [llvm] [libc++] Optionally support filecheck-based tests (PR #165769)

[Michael Buch via libcxx-commits]

https://github.com/Michael137 approved this pull request.

Tested this locally and it works great. So LGTM

I'll let the libc++/CI maintainers give final say

https://github.com/llvm/llvm-project/pull/165769