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

[Louis Dionne via libcxx-commits]

ldionne wrote:

>  The advantage of using __init_with_size lies in its internal use of exception guard, thus simplifying the code.

Does this patch add an exception guard that wasn't there before? If so, are we fixing an exception safety issue that we were not handling before? If that's the case, this needs a test.

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