[libcxx-commits] [libcxx] [libc++] Increase `atomic_ref`'s required alignment for small types (PR #99654)

[James Y Knight via libcxx-commits]

jyknight wrote:

> What happens when the alignment requirement is not satisfied? Is it only that we will incorrectly report that the `atomic_ref` is always lock free when in reality it uses a lock under the hood due to the incorrect alignment?

On common platforms, you may get either silently-non-atomic accesses or a crash.

https://github.com/llvm/llvm-project/pull/99654