[libcxx-commits] [libcxx] [libc++][lit] Allow overriding the executor for tests (PR #66545)

[Louis Dionne via libcxx-commits]

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

I really like this! Minor nitpick in `params.py` but this basically LGTM.

https://github.com/llvm/llvm-project/pull/66545