[tree-ssa] New testcase

[law at redhat dot com]

I forgot to check this in while fixing up handling of nonlocal gotos.
It's a test that tree-ssa would fail before my changes, but which
passes after my changes (and while it looks similar to one of the
tests in our testsuite, it is in fact different....)


main()
{
  __label__ l;

  void*x()
  {
    goto l;
  }

  x();
  abort();
  return;
l:
  exit(0);
}