fix lower_copyB not invalidating irn_outs

ir/lower/lower_copyb.c

@@ -66,7 +66,7 @@ static ir_mode *get_ir_mode(unsigned bytes)
  */
 static void lower_copyb_nodes(ir_node *irn, unsigned mode_bytes)
 {
-	ir_graph        *irg = current_ir_graph;
+	ir_graph        *irg = get_irn_irg(irn);
 	unsigned         size;
 	unsigned         offset;
 	ir_mode         *mode;
@@ -167,10 +167,8 @@ static void find_copyb_nodes(ir_node *irn, void *ctx)
 void lower_CopyB(ir_graph *irg, unsigned max_size, unsigned native_mode_bytes)
 {
 	walk_env_t env;
-	entry_t  *entry;
-	ir_graph *rem = current_ir_graph;
-
-	current_ir_graph = irg;
+	entry_t   *entry;
+	bool       changed = false;
 
 	obstack_init(&env.obst);
 	env.max_size = max_size;
@@ -179,8 +177,12 @@ void lower_CopyB(ir_graph *irg, unsigned max_size, unsigned native_mode_bytes)
 
 	list_for_each_entry(entry_t, entry, &env.list, list) {
 		lower_copyb_nodes(entry->copyb, native_mode_bytes);
+		changed = true;
+	}
+
+	if (changed) {
+		set_irg_outs_inconsistent(irg);
 	}
 
 	obstack_free(&env.obst, NULL);
-	current_ir_graph = rem;
 }