[libcxx-commits] [libcxx] Reapply "[libc++] Optimize num_put integral functions" (#131613) (PR #133572)

[Louis Dionne via libcxx-commits]

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

LGTM, please update the commit message.

Please give 48h for @alexfh to reply in case they want to take this for a spin internally.

https://github.com/llvm/llvm-project/pull/133572