[Bug tree-optimization/123803] [16 Regression] gmp-6.3.0 ICE during GIMPLE pass: slsr: verify_gimple failed since r16-7002-g8ae508ca5a3cf5

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123803

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced and cleaned up (and portable) testcase:
```
int f(int *x1,__SIZE_TYPE__ n) {
  return *(x1 + n) +
  *(x1 + 3 * n);
}
```