message: fix write-after-write race in omp is_sorted_*
diff: @@ -785,9 +785,8 @@ void is_sorted_by_column_index(
  const auto col_idxs = to_check->get_const_col_idxs();
  const auto size = to_check->get_size();
  bool local_is_sorted = true;
  -#pragma omp parallel for shared(local_is_sorted)
  +#pragma omp parallel for reduction(&& : local_is_sorted)
  for (size_type i = 0; i < size[0]; ++i) {
  -#pragma omp flush(local_is_sorted)
  // Skip comparison if any thread detects that it is not sorted
  if (local_is_sorted) {
  for (auto idx = row_ptrs[i] + 1; idx < row_ptrs[i + 1]; ++idx) {
  