fix critical_edge remover clearing too few properties

ir/opt/critical_edges.c

@@ -83,7 +83,9 @@ void remove_critical_cf_edges_ex(ir_graph *irg, int ignore_exception_edges)
 	irg_block_walk_graph(irg, NULL, walk_critical_cf_edges, &env);
 	if (env.changed) {
 		/* control flow changed */
-		clear_irg_properties(irg, IR_GRAPH_PROPERTY_CONSISTENT_DOMINANCE);
+		clear_irg_properties(irg, IR_GRAPH_PROPERTIES_ALL
+			& ~(IR_GRAPH_PROPERTY_ONE_RETURN
+				| IR_GRAPH_PROPERTY_MANY_RETURNS));
 	}
 	add_irg_properties(irg, IR_GRAPH_PROPERTY_NO_CRITICAL_EDGES);
 }