[libcxx-commits] [libcxx] [libc++][NFC] Centralize test for support of == and != in ranges (PR #78481)

[Konstantin Varlamov via libcxx-commits]

https://github.com/var-const approved this pull request.

Thanks for addressing the feedback! LGTM (with one very straightforward comment).

https://github.com/llvm/llvm-project/pull/78481