[Bug tree-optimization/114068] [14 regression] ICE when building darktable-4.6.1 (error: PHI node with wrong VUSE on edge from BB 25) since r14-8768

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114068

--- Comment #10 from Sam James <sjames at gcc dot gnu.org> ---
last one:
```
struct c {
  int b;
  int *d(int e) { return &b + e; }
};
struct g {
  c base;
  int f;
  void j() {
    if (f)
      __builtin_unreachable();
  }
  int &p(int e) {
    if (e > 1)
      __builtin_unreachable();
    return *base.d(e);
  }
} l;
struct h {
  g i;
  void q() { i.j(); }
} k;
int m;
void n() {
  h a = k;
  for (int o = m; o; ++o) {
    a.q();
    l.p(o) = 1;
  }
}
```