[JumpThreading] Avoid ConstantExpr::get() (NFCI)

This code requires the result to be an UndefValue/ConstantInt
anyway (checked by getKnownConstant), so we are only interested
in the case where this folds.

llvm/lib/Transforms/Scalar/JumpThreading.cpp

@@ -788,14 +788,16 @@ bool JumpThreadingPass::computeValueKnownInPredecessorsImpl(
     if (Preference != WantInteger)
       return false;
     if (ConstantInt *CI = dyn_cast<ConstantInt>(BO->getOperand(1))) {
+      const DataLayout &DL = BO->getModule()->getDataLayout();
       PredValueInfoTy LHSVals;
       computeValueKnownInPredecessorsImpl(BO->getOperand(0), BB, LHSVals,
                                           WantInteger, RecursionSet, CxtI);
 
       // Try to use constant folding to simplify the binary operator.
       for (const auto &LHSVal : LHSVals) {
         Constant *V = LHSVal.first;
-        Constant *Folded = ConstantExpr::get(BO->getOpcode(), V, CI);
+        Constant *Folded =
+            ConstantFoldBinaryOpOperands(BO->getOpcode(), V, CI, DL);
 
         if (Constant *KC = getKnownConstant(Folded, WantInteger))
           Result.emplace_back(KC, LHSVal.second);