[libcxx-commits] [libcxx] [libc++] Speed up classic locale (PR #72112)

[Louis Dionne via libcxx-commits]

ldionne wrote:

I took the freedom of applying the suggestion that doesn't require atomics at all, and rebasing on top of my other refactoring to save you the trouble of conflict resolution. @mordante @dvyukov What do you folks think about this?

https://github.com/llvm/llvm-project/pull/72112