Bugfix: support unknown control op subgraph

tests/ut/ge/hybrid/ge_hybrid_unittest.cc

@@ -269,6 +269,7 @@ TEST_F(UtestGeHybrid, unfold_subgraphs_success) {
   NodePtr sub_sub_graph_while_body_const_node = sub_sub_graph2->AddNode(sub_sub_graph_while_body_const_op_desc);*/
   OpDescPtr sub_sub_graph_while_body_data_op_desc = CreateOpDesc("body_data", DATA);
   NodePtr sub_sub_graph_while_body_data_node = sub_sub_graph2->AddNode(sub_sub_graph_while_body_data_op_desc);
+  sub_sub_graph2->SetGraphUnknownFlag(true);
   /*OpDescPtr sub_sub_graph_while_body_add_op_desc = CreateOpDesc("body_add", ADD);
   NodePtr sub_sub_graph_while_body_add_node = sub_sub_graph2->AddNode(sub_sub_graph_while_body_add_node);
   sub_sub_graph_while_body_add_node->AddLinkFrom(sub_sub_graph_while_body_data_node);
@@ -277,7 +278,7 @@ TEST_F(UtestGeHybrid, unfold_subgraphs_success) {
   ComputeGraphPtr sub_graph = std::make_shared<ComputeGraph>("sub_graph");
   OpDescPtr sub_graph_while_op_desc = CreateOpDesc("while", WHILE);
   NodePtr sub_graph_while_node = sub_graph->AddNode(sub_graph_while_op_desc);
-  sub_graph->SetGraphUnknownFlag(true);
+  sub_graph->SetGraphUnknownFlag(false);
   sub_graph_while_node->GetOpDesc()->AddSubgraphName("while_cond");
   sub_graph_while_node->GetOpDesc()->AddSubgraphName("while_body");
   sub_graph_while_node->GetOpDesc()->SetSubgraphInstanceName(0, "while_cond");
@@ -289,6 +290,7 @@ TEST_F(UtestGeHybrid, unfold_subgraphs_success) {
   partitioned_call_node->GetOpDesc()->AddSubgraphName("sub_graph");
   partitioned_call_node->GetOpDesc()->SetSubgraphInstanceName(0, "sub_graph");
 
+
   root_graph->AddSubGraph(sub_sub_graph1);
   root_graph->AddSubGraph(sub_sub_graph2);
   sub_sub_graph1->SetParentGraph(root_graph);