[libcxx-commits] [libcxx] [libc++] Replace `__compressed_pair` with `[[no_unique_address]]` (PR #76756)

[Louis Dionne via libcxx-commits]

ldionne wrote:

CC @llvm/libcxx-vendors for awareness since this affects the ABI in minor ways.

https://github.com/llvm/llvm-project/pull/76756