[libc-commits] [libc] [libc][test] adds errno clearer test fixture, gtest-style errno and fp except assertions (PR #91608)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

This patch LGTM, but I'd like there to be a cmake configuration to use gtest instead of the internal testing framework so that we can confirm that everything works. You can do that before landing this patch or as a followup.

https://github.com/llvm/llvm-project/pull/91608