[libcxx-commits] [libcxx] [libc++][test] Fix unused and nodiscard warnings (PR #73437)

[via libcxx-commits]

philnik777 wrote:

Since you mention a few warning flags in the description, I think it would be good to add them to `libcxx/utils/libcxx/test/params.py` to avoid backsliding.

https://github.com/llvm/llvm-project/pull/73437