message: Support quantizing Mirror pad op.
diff: @@ -929,6 +929,12 @@ OperatorProperty GetOperatorProperty(const ModelT* model, int subgraph_index,
  property.restrict_same_input_output_scale = true;
  property.version = 1;
  break;
  + case BuiltinOperator_MIRROR_PAD:
  + property.inputs = {{0, {}}};
  + property.outputs = {{0, {}}};
  + property.restrict_same_input_output_scale = true;
  + property.version = 2;
  + break;
  default:
  // No quantized implementation exists for this operation.
  property.quantizable = false;
  