[libcxx-commits] [libcxx] [libc++] Introduce _LIBCPP_COMPRESSED_ELEMENT (PR #134253)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne requested changes to this pull request.

When we introduced `_LIBCPP_COMPRESSED_PAIR` and started using it, the ABI for a few weird types changed. We investigated it, decided it was fine, and documented that as a release note when we made the change. I think we need to do the same here. Otherwise, I don't see a problem with this patch.

https://github.com/llvm/llvm-project/pull/134253