[Bug target/110921] Relax _tzcnt_u32 support x86, all x86 arch support for this instrunction

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110921

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Testcase:
#include "x86intrin.h"

int f(int a, int b)
{
        return _tzcnt_u32   (a);
}