message: Fix compilation error on older compilers
diff: @@ -273,7 +273,7 @@ struct DataPropagationContextImpl : public DataPropagationContext {
  const std::unordered_map<std::string, TypeProto*>& valueTypesByName,
  const std::unordered_map<std::string, const TensorProto*>& inputDataByName,
  std::unordered_map<std::string, TensorShapeProto>& generatedShapeData)
  - : generatedShapeData_{generatedShapeData} {
  + : generatedShapeData_(generatedShapeData) {
  size_t input_idx = 0;
  for (auto& attr : *n.mutable_attribute()) {
  