message: serialized model data in test driver, ir version is now corrected
diff: @@ -158,12 +158,14 @@ class ONNXCppDriverTest
  model_.graph().initializer(0));
  weightDescriptors_pointer = &weightDescriptors;
  }
  + std::string serialized_model;
  + model_.SerializeToString(&serialized_model);
  EXPECT_EQ(
  lib.onnxInitGraph(
  backend,
  NULL,
  - sizeof(model_),
  - &model_,
  + serialized_model.size(),
  + serialized_model.c_str(),
  weightCount,
  weightDescriptors_pointer,
  &graph),
  