[libcxx-commits] [libcxx] Replace uses of `__libcpp_ctz` by `__countr_zero` (PR #132639)

[Mark de Wever via libcxx-commits]

mordante wrote:

> Hi @PaulXiCao, thanks for your efforts in addressing this issue! Just to provide some context—this issue was opened a week ago as a follow-up to my previous work and was assigned to me shortly thereafter. I’ve been actively working on related patches, but since this change depends on dropping Clang 18 support, I hadn’t submitted a patch yet.
> 
> While I truly appreciate your enthusiasm and contribution, I think it would be helpful in the future to check with the assignee before working on a recently assigned issue, especially if it’s a follow-up to their prior work. This can help avoid duplicated effort and ensure smoother collaboration. Thanks again!
 
FYI @winner245 removing Clang-18 support is blocked by some CI runners, the maintainers for these runners are working on upgrading the clang version of their runners.

https://github.com/llvm/llvm-project/pull/132639