[libcxx-commits] [libcxx] [libc++] Add `__find_end` optimizations back (PR #171374)

[Louis Dionne via libcxx-commits]

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

This is related to https://github.com/llvm/llvm-project/issues/129318, but doesn't solve it entirely since we need to do a proper investigation of whether additional gains are possible.

https://github.com/llvm/llvm-project/pull/171374