[libcxx-commits] [libcxx] [libc++] Replace __libcpp_{ctz, clz} with __builtin_{ctzg, clzg} (PR #133920)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 approved this pull request.

Thanks for the cleanup! LGTM with nit addressed.

https://github.com/llvm/llvm-project/pull/133920