[Bug tree-optimization/119186] Using __builtin_ctz results in a error result.

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119186

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
With GCC 15 you can use __builtin_ctzg which can accept zero.

Or just use std::count_rzero instead.