[Bug target/116509] 128bit integer compares can be improved

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116509

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note for:
```
bool test1(__int128 a, __int128 b) {
  return a == 0;
}
```
LLVM produces:
```
        orr     x8, x0, x1
        cmp     x8, #0
        cset    w0, eq
        ret
```

Which I think is better than using ccmp here.