[Bug tree-optimization/125637] Missed optimization when reorder C ternary with -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125637

--- Comment #1 from Drea Pinski <pinskia at gcc dot gnu.org> ---
```
  <bb 2> [local count: 1073741824]:
  if (c_3(D) != 0)
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 536870912]:
  use32 (y1_5(D));
  goto <bb 5>; [100.00%]

  <bb 4> [local count: 536870912]:
  use32 (x_4(D));

  <bb 5> [local count: 1073741824]:
  # hi_2 = PHI <y2_8(D)(3), x_4(D)(4)>
```

This part is a dup of PR 51964 (and a few others).