[libcxx-commits] [libcxx] [libc++] Make _LIBCPP_ASSUME usable when it is appropriate (PR #91801)

[Konstantin Varlamov via libcxx-commits]

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

So sorry about the very slow review! LGTM.

https://github.com/llvm/llvm-project/pull/91801