[IR] Use range-based for loops (NFC)

Author: kazutakahirata

llvm/include/llvm/IR/LegacyPassManagers.h

@@ -335,8 +335,8 @@ class PMDataManager {
   /// Initialize available analysis information.
   void initializeAnalysisInfo() {
     AvailableAnalysis.clear();
-    for (unsigned i = 0; i < PMT_Last; ++i)
-      InheritedAnalysis[i] = nullptr;
+    for (auto &IA : InheritedAnalysis)
+      IA = nullptr;
   }
 
   // Return true if P preserves high level analysis used by other
@@ -392,9 +392,8 @@ class PMDataManager {
   // Collect AvailableAnalysis from all the active Pass Managers.
   void populateInheritedAnalysis(PMStack &PMS) {
     unsigned Index = 0;
-    for (PMStack::iterator I = PMS.begin(), E = PMS.end();
-         I != E; ++I)
-      InheritedAnalysis[Index++] = (*I)->getAvailableAnalysis();
+    for (PMDataManager *PMDM : PMS)
+      InheritedAnalysis[Index++] = PMDM->getAvailableAnalysis();
   }
 
   /// Set the initial size of the module if the user has specified that they

llvm/lib/IR/AsmWriter.cpp

@@ -1088,9 +1088,8 @@ int SlotTracker::processIndex() {
 
   // Start numbering the TypeIds after the GUIDs.
   TypeIdNext = GUIDNext;
-  for (auto TidIter = TheIndex->typeIds().begin();
-       TidIter != TheIndex->typeIds().end(); TidIter++)
-    CreateTypeIdSlot(TidIter->second.first);
+  for (const auto &TID : TheIndex->typeIds())
+    CreateTypeIdSlot(TID.second.first);
 
   ST_DEBUG("end processIndex!\n");
   return TypeIdNext;
@@ -4028,8 +4027,8 @@ void AssemblyWriter::printInstruction(const Instruction &I) {
     Out << ' ';
     writeOperand(I.getOperand(0), true); Out << ", ";
     writeOperand(I.getOperand(1), true);
-    for (const unsigned *i = IVI->idx_begin(), *e = IVI->idx_end(); i != e; ++i)
-      Out << ", " << *i;
+    for (unsigned i : IVI->indices())
+      Out << ", " << i;
   } else if (const LandingPadInst *LPI = dyn_cast<LandingPadInst>(&I)) {
     Out << ' ';
     TypePrinter.print(I.getType(), Out);
@@ -4431,9 +4430,8 @@ void AssemblyWriter::writeAllAttributeGroups() {
   std::vector<std::pair<AttributeSet, unsigned>> asVec;
   asVec.resize(Machine.as_size());
 
-  for (SlotTracker::as_iterator I = Machine.as_begin(), E = Machine.as_end();
-       I != E; ++I)
-    asVec[I->second] = *I;
+  for (auto &I : llvm::make_range(Machine.as_begin(), Machine.as_end()))
+    asVec[I.second] = I;
 
   for (const auto &I : asVec)
     Out << "attributes #" << I.second << " = { "

llvm/lib/IR/DebugInfo.cpp

@@ -353,16 +353,12 @@ bool llvm::stripDebugInfo(Function &F) {
 bool llvm::StripDebugInfo(Module &M) {
   bool Changed = false;
 
-  for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
-         NME = M.named_metadata_end(); NMI != NME;) {
-    NamedMDNode *NMD = &*NMI;
-    ++NMI;
-
+  for (NamedMDNode &NMD : llvm::make_early_inc_range(M.named_metadata())) {
     // We're stripping debug info, and without them, coverage information
     // doesn't quite make sense.
-    if (NMD->getName().startswith("llvm.dbg.") ||
-        NMD->getName() == "llvm.gcov") {
-      NMD->eraseFromParent();
+    if (NMD.getName().startswith("llvm.dbg.") ||
+        NMD.getName() == "llvm.gcov") {
+      NMD.eraseFromParent();
       Changed = true;
     }
   }