[Bug tree-optimization/114999] A few missing optimizations due to `a - b` and `b - a` not being detected as negatives of each other

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114999

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
```
int f(int x)
{
        x = ~x;
        int t = (x >= 0 ? x : 0);
        int t1 = (x <= 0 ? -x : 0);
        return  t + t1;
}
```

abs(~x)