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

[Nico Weber via libcxx-commits]

nico wrote:

> Can you add a description of how this is different from the original PR in this PR itself? I looked for differences but it didn't jump at me.

(Aside: One way to handle relands is to have a pure reland commit that just reverts the revert without any changes as first commit on the PR, and then a second commit on the PR that has the fixups. That makes it easy to see what changed. Maybe that's something y'all want to adopt for relands.)

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