message: Do not use C++17 emplace_back
diff: @@ -35,7 +35,8 @@ TEST(LookupOpsTest, LookupTableFindV2_ShapeFn) {
  .Finalize(&op.node_def));
  std::vector<std::vector<ShapeInferenceTestOp::ShapeAndType>> types;
  auto set_types = [&op, &types](DataType key_type, DataType value_type) {
  - auto& table = types.emplace_back();
  + types.emplace_back();
  + auto& table = types.back();
  table.emplace_back("[3]", key_type);
  table.emplace_back("[4]", value_type);
  op.input_resource_handle_shapes_and_types = {&table, nullptr, nullptr};
  @@ -64,7 +65,8 @@ TEST(LookupOpsTest, LookupTableExportV2_ShapeFn) {
  .Finalize(&op.node_def));
  std::vector<std::vector<ShapeInferenceTestOp::ShapeAndType>> types;
  auto set_types = [&op, &types](DataType key_type, DataType value_type) {
  - auto& table = types.emplace_back();
  + types.emplace_back();
  + auto& table = types.back();
  table.emplace_back("[3]", key_type);
  table.emplace_back("[4]", value_type);
  op.input_resource_handle_shapes_and_types = {&table};
  