[Bug target/80713] recent crash in update_dep_bb

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80713

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Reduced code is this:

a, b, d, e, f;
*c;
g() {
  for (;;) {
    if (*c) {
      int h;
      *c = &h;
    } else
      b = 0;
    if (f)
      *c = g;
    else
      for (; a; a++)
        for (;;) {
          if (d)
            break;
          c = e;
        }
  }
}