[libcxx-commits] [libcxx] [libc++] Implement `<bit>` parts of P3793R2 Better shifting (PR #219389)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 requested changes to this pull request.

The commit message shouldn't be closing the issue, since the paper isn't fully implemented.

https://github.com/llvm/llvm-project/pull/219389