message: limited multi_to_one_reduce_final register nums
diff: @@ -167,7 +167,8 @@ __global__ void multi_to_one_reduce_vec4(CopyDesc copy_desc, DST_T* partial_buff
  }
  template <typename CopyDesc, int kMaxElemPerThread, int kWarpSize>
  -__global__ void multi_to_one_reduce_final(CopyDesc copy_desc, int max_ev_length) {
  +__launch_bounds__(1024, 1) __global__
  + void multi_to_one_reduce_final(CopyDesc copy_desc, int max_ev_length) {
  using src_type = typename CopyDesc::SrcT;
  using dst_type = typename CopyDesc::DstT;
  using vec_length_type = int;
  