ddebug_apply_class_bitmap
totct += ddebug_apply_class_bitmap(dcp, &curr_bits, dcp->bits);
totct += ddebug_apply_class_bitmap(dcp, &curr_bits, &old_bits);
totct += ddebug_apply_class_bitmap(dcp, &inrep, dcp->bits);
totct += ddebug_apply_class_bitmap(dcp, &new_bits, &old_bits);