message: [lite] Enhance the error message of converter failure for unsupported ops.
diff: @@ -1781,21 +1781,22 @@ Optional<std::string> Translator::TranslateInternal() {
  if (first_failed_func != -1) {
  std::string failed_flex_ops_summary =
  - GetOpsSummary(failed_flex_ops_, /*summary_title=*/"Flex");
  + GetOpsSummary(failed_flex_ops_, /*summary_title=*/"TF Select");
  std::string failed_custom_ops_summary =
  GetOpsSummary(failed_custom_ops_, /*summary_title=*/"Custom");
  std::string err;
  if (!failed_flex_ops_.empty())
  err +=
  - "Some ops are not supported by the native TFLite runtime, you can "
  + "\nSome ops are not supported by the native TFLite runtime, you can "
  "enable TF kernels fallback using TF Select. See instructions: "
  - "https://www.tensorflow.org/lite/guide/ops_select" +
  - failed_flex_ops_summary;
  + "https://www.tensorflow.org/lite/guide/ops_select \n" +
  + failed_flex_ops_summary + "\n";
  if (!failed_custom_ops_.empty())
  err +=
  - "Some ops in the model are custom ops, See instructions to implement "
  - "custom ops: https://www.tensorflow.org/lite/guide/ops_custom" +
  - failed_custom_ops_summary;
  + "\nSome ops in the model are custom ops, "
  + "See instructions to implement "
  + "custom ops: https://www.tensorflow.org/lite/guide/ops_custom \n" +
  + failed_custom_ops_summary + "\n";
  auto& failed_region = named_regions[first_failed_func];
  return failed_region.second->getParentOp()->emitError()
  