enqueue users of Bad as well in optimize_graph_df

ir/ir/irgopt.c

@@ -214,8 +214,7 @@ int optimize_graph_df(ir_graph *irg)
 	/* finish the wait queue */
 	while (! pdeq_empty(waitq)) {
 		ir_node *n = (ir_node*)pdeq_getl(waitq);
-		if (! is_Bad(n))
-			opt_walker(n, waitq);
+		opt_walker(n, waitq);
 	}
 
 	del_pdeq(waitq);