[Bug middle-end/50847] missed warning about unreachable code after throw statment.

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=50847

--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Other testcases:

int baz()
{
  while(1) {
        break;
        return 5; // dead
   }
  do {
        continue;
        return 6; // dead
   } while(0);
  return 1;
}

int bax()
{
  while(1) {
        goto end;
        return 5; // dead
   }
end:
  return 1;
}