[libcxx-commits] [libcxx] [libc++] Implement `std::flat_multiset` (PR #128363)

[Louis Dionne via libcxx-commits]

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

Thanks for the patch! I have some comments, but once they are addressed I am comfortable with this being merged. I did a less thorough review but I am relying on the fact that this is so similar to the other flat containers that most aspects of this have already been discussed many times.

https://github.com/llvm/llvm-project/pull/128363