message: Remove AddN from list of exportable ops since TF Lite doesn't have a builtin
  implementation for it.
diff: @@ -1526,11 +1526,11 @@ std::vector<std::unique_ptr<BaseOperator>> BuildOperatorList(
  OperatorType::kUnsupported,
  enable_select_tf_ops));
  - // There operators are supported by Toco, but not by TF Lite, and has no
  - // attributes.
  - ops.push_back(
  - MakeUnique<SimpleOperator<AddNOperator>>("ADDN", OperatorType::kAddN));
  - // Simple Operators.
  + // SimpleOperator was designed to export CUSTOM TF Lite ops, but has since
  + // been modified to also export builtins. As TOCO evolved we added warnings
  + // when custom ops are exported but SimpleOperator bypasses thoses. To
  + // prevent user confusion we are settling on using SimpleOperator only for
  + // builtins.
  ops.push_back(MakeUnique<SimpleOperator<DequantizeOperator>>(
  "DEQUANTIZE", OperatorType::kDequantize));
  ops.push_back(
  