message: Remove the depthwise conv 3x3 output shift > 0 restriction for per-channel. (it's a obsolete restriction), we're using sqrshl, so it's fine to handle output_shift <= 0 case.
diff: @@ -453,7 +453,6 @@ inline bool Fast3x3FilterKernelSupported(
  const int32 filter_width = filter_shape.Dims(2);
  const int32 output_height = output_shape.Dims(1);
  const int32 output_width = output_shape.Dims(2);
  - const int32 output_depth = output_shape.Dims(3);
  bool supported =
  filter_width == 3 && filter_height == 3 && depth_multiplier == 1 &&
  @@ -468,14 +467,6 @@ inline bool Fast3x3FilterKernelSupported(
  return false;
  }
  - if (quantization_type == QuantizationType::kPerChannelInt8) {
  - for (int i = 0; i < output_depth; ++i) {
  - if (output_shift_ptr[i] > 0) {
  - return false;
  - }
  - }
  - }
  -
  // Handle case where padding is zero but padding type is not kValid.
  // This would require special boundary case handling that is not supported.
  