[libcxx-commits] [libcxx] [libc++][test] Fix simple warnings (PR #74186)

[Louis Dionne via libcxx-commits]

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

Not a huge fan of the new macros because they won't compose super well, but it'll do. Thanks for the fix!

https://github.com/llvm/llvm-project/pull/74186