[Bug target/120144] [15/16 Regression] ICE when building libstdc++ on mips64-elf

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120144

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
int f(unsigned __int128 t)
{
  return __builtin_clzg(t);
}
```