Remove comment that I put to disable node label

src/mpi_collective_pass.cpp

@@ -85,10 +85,10 @@ unsigned int pass_mpi_collective::execute(function *fun)
 	calc_dom_data();
 
 	label_collec(fun);
-	//label_dom(fun);
-	//label_post_dom(fun);
-	//label_dom_front(fun);
-	//label_post_dom_front(fun);
+	label_dom(fun);
+	label_post_dom(fun);
+	label_dom_front(fun);
+	label_post_dom_front(fun);
 
 	mark_edge(fun);
 	rank_collective(fun);