message: Fix opt build failure
diff: @@ -404,6 +404,7 @@ SingleResultAffineNormalizer::SingleResultAffineNormalizer(
  assert(!pred->getDefiningInst() ||
  !pred->getDefiningInst()->isa<AffineApplyOp>() &&
  "AffineApplyOp chain of length > 1");
  + (void)pred;
  }
  exprs.push_back(renumber(app));
  } else if (auto constant = inst->dyn_cast<ConstantOp>()) {
  