[CallSite removal][CloneFunction] Use CallSite instead of CallBase. NFC

[mtrofin]

lgtm

llvm/lib/Transforms/Utils/CloneFunction.cpp

for (BasicBlock::const_iterator II = StartingInst, IE = --BB->end();
 
     if (II->hasName())
       NewInst->setName(II->getName()+NameSuffix);
     VMap[&*II] = NewInst; // Add instruction map to value.
     NewBB->getInstList().push_back(NewInst);
     hasCalls |= (isa<CallInst>(II) && !isa<DbgInfoIntrinsic>(II));
 
     if (CodeInfo)
-      if (auto CS = ImmutableCallSite(&*II))
-        if (CS.hasOperandBundles())
+      if (auto *CB = dyn_cast<CallBase>(&*II))
+        if (CB->hasOperandBundles())
           CodeInfo->OperandBundleCallSites.push_back(NewInst);
 
     if (const AllocaInst *AI = dyn_cast<AllocaInst>(II)) {
       if (isa<ConstantInt>(AI->getArraySize()))
         hasStaticAllocas = true;
       else
         hasDynamicAllocas = true;
     }
void PruningFunctionCloner::CloneBlock(const BasicBlock *BB,
   if (!TerminatorDone) {
     Instruction *NewInst = OldTI->clone();
     if (OldTI->hasName())
       NewInst->setName(OldTI->getName()+NameSuffix);
     NewBB->getInstList().push_back(NewInst);
     VMap[OldTI] = NewInst;             // Add instruction map to value.
 
     if (CodeInfo)
-      if (auto CS = ImmutableCallSite(OldTI))
-        if (CS.hasOperandBundles())
+      if (auto *CB = dyn_cast<CallBase>(OldTI))
+        if (CB->hasOperandBundles())
           CodeInfo->OperandBundleCallSites.push_back(NewInst);
 
     // Recursively clone any reachable successor blocks.
     const Instruction *TI = BB->getTerminator();
     for (const BasicBlock *Succ : successors(TI))
       ToClone.push_back(Succ);
   }
 
#endif
   for (unsigned Idx = 0; Idx != Worklist.size(); ++Idx) {
     const Value *OrigV = Worklist[Idx];
     auto *I = dyn_cast_or_null<Instruction>(VMap.lookup(OrigV));
     if (!I)
       continue;
 
     // Skip over non-intrinsic callsites, we don't want to remove any nodes from
     // the CGSCC.
-    CallSite CS = CallSite(I);
-    if (CS && CS.getCalledFunction() && !CS.getCalledFunction()->isIntrinsic())
+    CallBase *CB = dyn_cast<CallBase>(I);
+    if (CB && CB->getCalledFunction() &&
+        !CB->getCalledFunction()->isIntrinsic())
       continue;
 
     // See if this instruction simplifies.
     Value *SimpleV = SimplifyInstruction(I, DL);
     if (!SimpleV)
       continue;
 
     // Stash away all the uses of the old instruction so we can check them for