message: Treat LegacyFedInput as a placeholder in full flex mode
diff: @@ -2230,6 +2230,7 @@ ConverterMapType GetTensorFlowNodeConverterMapForFlex() {
  return std::unordered_map<std::string, ConverterType>({
  // We need to let TCO convert Placeholder information into
  // array data, so that the data types are correct.
  + {"LegacyFedInput", ConvertPlaceholderOperator},
  {"Placeholder", ConvertPlaceholderOperator},
  });
  }
  