message: [XLA] Fix a bug in ToProto: don't add gather attributes twice.
diff: @@ -2451,12 +2451,6 @@ HloInstructionProto HloInstruction::ToProto() const {
  proto.add_fft_length(fft_len);
  }
  - if (gather_dimension_numbers_ != nullptr) {
  - *proto.mutable_gather_dimension_numbers() = *gather_dimension_numbers_;
  - }
  - for (int64 bound : gather_window_bounds_) {
  - proto.add_gather_window_bounds(bound);
  - }
  proto.set_channel_name(channel_name_);
  proto.set_cost_estimate_ns(cost_estimate_ns_);
  