[llvm-branch-commits] [libcxx] [libc++][bit] Improves rotate functions. (#98032) (PR #101892)

[Mark de Wever via llvm-branch-commits]

mordante wrote:

This is the cherry-pick of https://github.com/llvm/llvm-project/pull/98032

https://github.com/llvm/llvm-project/pull/101892