[Bug tree-optimization/101541] Missing ABSU detection at gimple

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101541

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Another one missed:
```
unsigned abssat2 (unsigned x)
{
    int y = x;

    if (y < 0)
        x = -x;

  return x;
}
```

I have a patch for the this case, I think. Working on the other case now.