[NFC][IRCE] Remove dead variables

[aleksandr.popov]

7e38ee6765647353ef8e5adbec2de4ef11606992

llvm/lib/Transforms/Scalar/InductiveRangeCheckElimination.cpp

bool InductiveRangeCheckElimination::run(
   }
   LoopStructure LS = *MaybeLoopStructure;
   if (!isProfitableToTransform(*L, LS))
     return false;
   const SCEVAddRecExpr *IndVar =
       cast<SCEVAddRecExpr>(SE.getMinusSCEV(SE.getSCEV(LS.IndVarBase), SE.getSCEV(LS.IndVarStep)));
 
   std::optional<InductiveRangeCheck::Range> SafeIterRange;
-  Instruction *ExprInsertPt = Preheader->getTerminator();
 
   SmallVector<InductiveRangeCheck, 4> RangeChecksToEliminate;
   // Basing on the type of latch predicate, we interpret the IV iteration range
   // as signed or unsigned range. We use different min/max functions (signed or
   // unsigned) when intersecting this range with safe iteration ranges implied
   // by range checks.
   auto IntersectRange =
       LS.IsSignedPredicate ? IntersectSignedRange : IntersectUnsignedRange;
 
-  IRBuilder<> B(ExprInsertPt);
   for (InductiveRangeCheck &IRC : RangeChecks) {
     auto Result = IRC.computeSafeIterationSpace(SE, IndVar,
                                                 LS.IsSignedPredicate);
     if (Result) {
       auto MaybeSafeIterRange = IntersectRange(SE, SafeIterRange, *Result);
       if (MaybeSafeIterRange) {
         assert(!MaybeSafeIterRange->isEmpty(SE, LS.IsSignedPredicate) &&
                "We should never return empty ranges!");