load/save power performance models too

src/core/task.c

@@ -253,6 +253,9 @@ int starpu_task_submit(struct starpu_task *task)
 
 		if (task->cl->model)
 			_starpu_load_perfmodel(task->cl->model);
+
+		if (task->cl->power_model)
+			_starpu_load_perfmodel(task->cl->power_model);
 	}
 
 	/* If profiling is activated, we allocate a structure to store the