[Bug target/111078] csneg is not used for (cset) * 2 - 1

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111078

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Another form:
```
int f1(int a, int b)
{
  int t = a != b;
  return (-t)|1;
}
```