[libcxx-commits] [libcxx] Make ios_base::xalloc non-atomic with LIBCXX_ENABLE_THREADS=OFF. (PR #208356)

[Louis Dionne via libcxx-commits]

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

I dislike the fact that this is basically a workaround for not having a proper setup with the atomics library, but this is a pragmatic and minimal restoration of previous behavior that changed unintentionally, so I think it's acceptable.

https://github.com/llvm/llvm-project/pull/208356