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

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

The fix https://github.com/llvm/llvm-project/pull/86188/commits/8cfdd0e96a15de205bea4f3fc2a1b78bc64e2274 is stacked on the original commit for easier review.

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