message: fix Intel omp collapsed reduction issues
diff: @@ -156,7 +156,7 @@ void count_nonzeros(std::shared_ptr<const OmpExecutor> exec,
  const auto max_nnz_per_row = source->get_num_stored_elements_per_row();
  const auto stride = source->get_stride();
  -#pragma omp parallel for collapse(2) reduction(+ : nonzeros)
  +#pragma omp parallel for reduction(+ : nonzeros)
  for (size_type row = 0; row < num_rows; row++) {
  for (size_type i = 0; i < max_nnz_per_row; i++) {
  nonzeros += (source->val_at(row, i) != zero<ValueType>());
  