[llvm-branch-commits] [libcxx] release/21.x: [libc++] Fix hash_multi{map, set}::insert (#149290) (PR #149435)

[Tobias Hieta via llvm-branch-commits]

tru wrote:

Can we get that fix backported so that the CI works on libc++ for the release branch properly?

https://github.com/llvm/llvm-project/pull/149435