[libcxx-commits] [libcxx] [libc++] Refactor vector move constructor with allocator (PR #116449)

[Louis Dionne via libcxx-commits]

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

LGTM. I pulled the patch locally and can confirm that the test before the patch doesn't actually test anything. So this both refactors the code and also makes sure that the test is working properly.

Since this is a small change, let's land this before the other vector refactorings.

https://github.com/llvm/llvm-project/pull/116449