[libcxx-commits] [libcxx] [libc++] Avoid including vector in <functional> (PR #144310)

[Louis Dionne via libcxx-commits]

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

LGTM. After verification, we already include `<vector>` in `<functional>` for transitive-includes stability, so this shouldn't have user impact.

https://github.com/llvm/llvm-project/pull/144310