[libc-commits] [libc] [libc] Add reverse_iterator comparisons (PR #86147)

[Nick Desaulniers via libc-commits]

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

Thanks! I had the equality operators locally, but then got hung up adapting `BlockStore::Iterator` to make use of this, then got distracted by other fires.

https://github.com/llvm/llvm-project/pull/86147