[SelectionDAG] Fix "unused variable" warnings after #119268 (NFC) (#119550)

Author: s-barannikov

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -2195,7 +2195,6 @@ void SelectionDAGBuilder::visitRet(const ReturnInst &I) {
 
   if (!FuncInfo.CanLowerReturn) {
     Register DemoteReg = FuncInfo.DemoteRegister;
-    const Function *F = I.getParent()->getParent();
 
     // Emit a store of the return value through the virtual register.
     // Leave Outs empty so that LowerReturn won't try to load return
@@ -10980,7 +10979,6 @@ std::pair<SDValue, SDValue>
 TargetLowering::LowerCallTo(TargetLowering::CallLoweringInfo &CLI) const {
   // Handle the incoming return values from the call.
   CLI.Ins.clear();
-  Type *OrigRetTy = CLI.RetTy;
   SmallVector<EVT, 4> RetTys;
   SmallVector<TypeSize, 4> Offsets;
   auto &DL = CLI.DAG.getDataLayout();