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

[Dmitry Vyukov via libcxx-commits]

dvyukov wrote:

Should I squash and merge this? Or what's the next step?

There are some test failures, but they don't look related:

```
Failed Tests (1):
  llvm-libc++-shared.cfg.in :: std/input.output/string.streams/stringstream/stringstream.members/gcount.pass.cpp

Timed Out Tests (2):
  llvm-libc++-shared.cfg.in :: std/containers/sequences/deque/deque.modifiers/insert_iter_iter.pass.cpp
  llvm-libc++-shared.cfg.in :: std/numerics/rand/rand.dist/rand.dist.bern/rand.dist.bern.negbin/eval.pass.cpp
```

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