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

[Mark de Wever via libcxx-commits]

https://github.com/mordante commented:

Great to see we can do it without the atomics!

In general happy, but there is one issue and two nits.

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