message: Fix an error triggered when running the tests
  tmop_pa_tests_{debug,cuda} with MFEM_DEBUG enabled.
diff: @@ -1919,6 +1919,8 @@ void SparseMatrix::EliminateRowCol(int rc, DiagonalPolicy dpolicy)
  if (Rows == NULL)
  {
  + const auto &I = this->I; // only use const access for I
  + const auto &J = this->J; // only use const access for J
  for (int j = I[rc]; j < I[rc+1]; j++)
  {
  const int col = J[j];
  