[NFC] Remove redundant variable

[aeubanks]

ping

[shchenz]

LGTM. Sorry for the late.

llvm/lib/Target/PowerPC/PPCLoopInstrFormPrep.cpp

 SmallVector<Bucket, 16> PPCLoopInstrFormPrep::collectCandidates(
     Loop *L,
     std::function<bool(const Instruction *, const Value *)> isValidCandidate,
     unsigned MaxCandidateNum) {
   SmallVector<Bucket, 16> Buckets;
   for (const auto &BB : L->blocks())
     for (auto &J : *BB) {
       Value *PtrValue;
-      Instruction *MemI;
 
       if (LoadInst *LMemI = dyn_cast<LoadInst>(&J)) {
-        MemI = LMemI;
         PtrValue = LMemI->getPointerOperand();
       } else if (StoreInst *SMemI = dyn_cast<StoreInst>(&J)) {
-        MemI = SMemI;
         PtrValue = SMemI->getPointerOperand();
       } else if (IntrinsicInst *IMemI = dyn_cast<IntrinsicInst>(&J)) {
         if (IMemI->getIntrinsicID() == Intrinsic::prefetch ||
             IMemI->getIntrinsicID() == Intrinsic::ppc_vsx_lxvp) {
-          MemI = IMemI;
           PtrValue = IMemI->getArgOperand(0);
         } else if (IMemI->getIntrinsicID() == Intrinsic::ppc_vsx_stxvp) {
-          MemI = IMemI;
           PtrValue = IMemI->getArgOperand(1);
         } else continue;
       } else continue;
 
       unsigned PtrAddrSpace = PtrValue->getType()->getPointerAddressSpace();
       if (PtrAddrSpace)
         continue;
 
       if (L->isLoopInvariant(PtrValue))
         continue;
 
       const SCEV *LSCEV = SE->getSCEVAtScope(PtrValue, L);
       const SCEVAddRecExpr *LARSCEV = dyn_cast<SCEVAddRecExpr>(LSCEV);
       if (!LARSCEV || LARSCEV->getLoop() != L)
         continue;
 
       if (isValidCandidate(&J, PtrValue))
-        addOneCandidate(MemI, LSCEV, Buckets, MaxCandidateNum);
+        addOneCandidate(&J, LSCEV, Buckets, MaxCandidateNum);
     }
   return Buckets;
 }
 
 bool PPCLoopInstrFormPrep::prepareBaseForDispFormChain(Bucket &BucketChain,
                                                     InstrForm Form) {
   // RemainderOffsetInfo details:
   // key:            value of (Offset urem DispConstraint). For DSForm, it can