if (e->IsControlEdge()) {
              graph->AddControlEdge(const_node, e->dst());
              graph->RemoveEdge(e);
            } else {
              Node* dst = e->dst();
              int dst_input = e->dst_input();
              graph->RemoveEdge(e);
              graph->AddEdge(const_node, 0, dst, dst_input);
            }
          }
        }
      }
    }