message: change asm prefetch to builtin prefetch.
diff: @@ -2588,7 +2588,7 @@ struct DepthwiseConvMultiRowPerChannel {
  for (int32 i = 0; i < shuffle_params.input_height; i++) {
  const uint8* ptr = h_ptr;
  for (int32 j = 0; j < shuffle_params.input_width; j++) {
  - asm volatile("prfm pldl1keep, [%[ptr]]\n" ::[ptr] "r"(ptr) :);
  + optimized_ops_preload_l1_keep(ptr);
  ptr += params.input_depth;
  }
  h_ptr += params.input_row_size;
  @@ -2613,7 +2613,7 @@ struct DepthwiseConvMultiRowPerChannel {
  for (int32 i = 0; i < shuffle_params.input_height; i++) {
  const uint8* ptr = h_ptr;
  for (int32 j = 0; j < shuffle_params.input_width; j++) {
  - asm volatile("prfm pldl1keep, [%[ptr]]\n" ::[ptr] "r"(ptr) :);
  + optimized_ops_preload_l1_keep(ptr);
  ptr += params.input_depth;
  }
  h_ptr += params.input_row_size;
  