message: Fix PRELU and MIRROR_PAD operators wrongly marked as int16 quantizable
diff: @@ -850,6 +850,7 @@ OperatorProperty GetOperatorProperty(const ModelT* model, int subgraph_index,
  property.outputs = {{0, {}}};
  property.restrict_same_input_output_scale = false;
  property.version = 1;
  + property.quantizable_int16 = false;
  break;
  case BuiltinOperator_LEAKY_RELU:
  property.inputs = {{0, {}}};
  @@ -987,6 +988,7 @@ OperatorProperty GetOperatorProperty(const ModelT* model, int subgraph_index,
  property.outputs = {{0, {}}};
  property.restrict_same_input_output_scale = true;
  property.version = 2;
  + property.quantizable_int16 = false;
  break;
  case BuiltinOperator_REDUCE_MAX:
  case BuiltinOperator_REDUCE_MIN:
  