[Bug tree-optimization/123152] [16 regression] ICE when building Valgrind (dominator of 15 should be 42, not 44) since r16-6133-gca8d97f8cb8

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123152

--- Comment #3 from Sam James <sjames at gcc dot gnu.org> ---
Simpler:
```
char b;
int c(char *d) {
  int *a = 0;
  while (*d) {
    while (*a)
      if (*a++ == 1)
        return 1;
    d++;
  }
}
void e() {
  c(&b);
  char *f = &b;
  while (f[0])
    ++b;
}
```