[Transforms] Use range-based for loops (NFC) (#97576)

Author: kazutakahirata

llvm/lib/Transforms/InstCombine/InstructionCombining.cpp

@@ -4399,8 +4399,8 @@ Instruction *InstCombinerImpl::visitLandingPadInst(LandingPadInst &LI) {
   if (MakeNewInstruction) {
     LandingPadInst *NLI = LandingPadInst::Create(LI.getType(),
                                                  NewClauses.size());
-    for (unsigned i = 0, e = NewClauses.size(); i != e; ++i)
-      NLI->addClause(NewClauses[i]);
+    for (Constant *C : NewClauses)
+      NLI->addClause(C);
     // A landing pad with no clauses must have the cleanup flag set.  It is
     // theoretically possible, though highly unlikely, that we eliminated all
     // clauses.  If so, force the cleanup flag to true.

llvm/lib/Transforms/Utils/SimplifyCFG.cpp

@@ -5339,8 +5339,7 @@ bool SimplifyCFGOpt::simplifyUnreachable(UnreachableInst *UI) {
   std::vector<DominatorTree::UpdateType> Updates;
 
   SmallSetVector<BasicBlock *, 8> Preds(pred_begin(BB), pred_end(BB));
-  for (unsigned i = 0, e = Preds.size(); i != e; ++i) {
-    auto *Predecessor = Preds[i];
+  for (BasicBlock *Predecessor : Preds) {
     Instruction *TI = Predecessor->getTerminator();
     IRBuilder<> Builder(TI);
     if (auto *BI = dyn_cast<BranchInst>(TI)) {