[Bug middle-end/52894] [4.5,4.6,4.7,4.8 Regression] Stage1 bootstrap fails with gcc-4.6.3: Infinite loop in pointer_set_insert

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52894

--- Comment #3 from John David Anglin <danglin at gcc dot gnu.org> 2012-04-06 
22:43:09 UTC ---
cc1 is stuck in this loop in insert_aux:

  while (true)
    {
      if (slots[n] == p || slots[n] == 0)
        return n;
      else
        {
          ++n;
          if (n == n_slots)
            n = 0;
        }
    }

Fails even when pointer-set.c is compiled at -O0.