[Bug ipa/91508] Segfault due to referencing removed cgraph_node

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91508

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-08-21
            Version|unknown                     |9.2.1
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ick, indeed.  It might also get reused since it is ggc_free()d...

Note trunk has

      for (i = nnodes - 1; i >= 0; i--)
        {
          cgraph_node *node = order[i];

          /* Function could be inlined and removed as unreachable.  */
          if (node == NULL || removed_nodes.contains (node))
            continue;

already, but not the GCC 9 branch.