[libc-commits] [libc] [reland][libc] Add reverse_iterator comparisons (PR #86188)

[Nick Desaulniers via libc-commits]

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

Sorry I missed this in code review of #86147. I guess without calls to these methods (in tests or sources) we don't observe diagnostics at compile time?

https://github.com/llvm/llvm-project/pull/86188