[libcxx-commits] [libcxx] [libc++] Simplify string::reserve (PR #114869)

[Louis Dionne via libcxx-commits]

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

I think this is NFC, and there's no way to test this, so LGTM if CI passes.

https://github.com/llvm/llvm-project/pull/114869