[Bug sanitizer/115273] [12 Regression] passing zero to ctz() check missing

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115273

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
int f(int a)
{
        return __builtin_ctz(a) == 0;
}

int main(void)
{
        __builtin_printf("%d\n", f(0));
}
```