[Scalar] Remove an unnecessary cast (NFC) (llvm#150474)

getOperand() already returns Value *.

Author: kazutakahirata

llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp

@@ -3785,7 +3785,7 @@ LSRInstance::CollectLoopInvariantFixupsAndFormulae() {
         // Ignore icmp instructions which are already being analyzed.
         if (const ICmpInst *ICI = dyn_cast<ICmpInst>(UserInst)) {
           unsigned OtherIdx = !U.getOperandNo();
-          Value *OtherOp = const_cast<Value *>(ICI->getOperand(OtherIdx));
+          Value *OtherOp = ICI->getOperand(OtherIdx);
           if (SE.hasComputableLoopEvolution(SE.getSCEV(OtherOp), L))
             continue;
         }