diff --git a/llvm/include/llvm/CodeGen/AsmPrinter.h b/llvm/include/llvm/CodeGen/AsmPrinter.h
--- a/llvm/include/llvm/CodeGen/AsmPrinter.h
+++ b/llvm/include/llvm/CodeGen/AsmPrinter.h
@@ -87,7 +87,7 @@
   TargetMachine &TM;
 
   /// Target Asm Printer information.
-  const MCAsmInfo *MAI;
+  const MCAsmInfo *MAI = nullptr;
 
   /// This is the context for the output file that we are streaming. This owns
   /// all of the global MC-related objects for the generated translation unit.
@@ -111,7 +111,7 @@
   MachineLoopInfo *MLI = nullptr;
 
   /// Optimization remark emitter.
-  MachineOptimizationRemarkEmitter *ORE;
+  MachineOptimizationRemarkEmitter *ORE = nullptr;
 
   /// The symbol for the entry in __patchable_function_entires.
   MCSymbol *CurrentPatchableFunctionEntrySym = nullptr;
diff --git a/llvm/include/llvm/CodeGen/DebugHandlerBase.h b/llvm/include/llvm/CodeGen/DebugHandlerBase.h
--- a/llvm/include/llvm/CodeGen/DebugHandlerBase.h
+++ b/llvm/include/llvm/CodeGen/DebugHandlerBase.h
@@ -55,10 +55,10 @@
   DebugHandlerBase(AsmPrinter *A);
 
   /// Target of debug info emission.
-  AsmPrinter *Asm;
+  AsmPrinter *Asm = nullptr;
 
   /// Collected machine module information.
-  MachineModuleInfo *MMI;
+  MachineModuleInfo *MMI = nullptr;
 
   /// Previous instruction's location information. This is used to
   /// determine label location to indicate scope boundaries in debug info.
@@ -73,7 +73,7 @@
   DebugLoc PrologEndLoc;
 
   /// This block includes epilogue instructions.
-  const MachineBasicBlock *EpilogBeginBlock;
+  const MachineBasicBlock *EpilogBeginBlock = nullptr;
 
   /// If nonnull, stores the current machine instruction we're processing.
   const MachineInstr *CurMI = nullptr;
diff --git a/llvm/include/llvm/CodeGen/EdgeBundles.h b/llvm/include/llvm/CodeGen/EdgeBundles.h
--- a/llvm/include/llvm/CodeGen/EdgeBundles.h
+++ b/llvm/include/llvm/CodeGen/EdgeBundles.h
@@ -22,7 +22,7 @@
 namespace llvm {
 
 class EdgeBundles : public MachineFunctionPass {
-  const MachineFunction *MF;
+  const MachineFunction *MF = nullptr;
 
   /// EC - Each edge bundle is an equivalence class. The keys are:
   ///   2*BB->getNumber()   -> Ingoing bundle.
diff --git a/llvm/include/llvm/CodeGen/ExecutionDomainFix.h b/llvm/include/llvm/CodeGen/ExecutionDomainFix.h
--- a/llvm/include/llvm/CodeGen/ExecutionDomainFix.h
+++ b/llvm/include/llvm/CodeGen/ExecutionDomainFix.h
@@ -118,9 +118,9 @@
   SmallVector<DomainValue *, 16> Avail;
 
   const TargetRegisterClass *const RC;
-  MachineFunction *MF;
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
+  MachineFunction *MF = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   std::vector<SmallVector<int, 1>> AliasMap;
   const unsigned NumRegs;
   /// Value currently in each register, or NULL when no value is being tracked.
@@ -133,7 +133,7 @@
   using OutRegsInfoMap = SmallVector<LiveRegsDVInfo, 4>;
   OutRegsInfoMap MBBOutRegsInfos;
 
-  ReachingDefAnalysis *RDA;
+  ReachingDefAnalysis *RDA = nullptr;
 
 public:
   ExecutionDomainFix(char &PassID, const TargetRegisterClass &RC)
diff --git a/llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h b/llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
--- a/llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/IRTranslator.h
@@ -67,7 +67,7 @@
 
 private:
   /// Interface used to lower the everything related to calls.
-  const CallLowering *CLI;
+  const CallLowering *CLI = nullptr;
 
   /// This class contains the mapping between the Values to vreg related data.
   class ValueToVRegInfo {
@@ -553,24 +553,24 @@
   std::unique_ptr<MachineIRBuilder> EntryBuilder;
 
   // The MachineFunction currently being translated.
-  MachineFunction *MF;
+  MachineFunction *MF = nullptr;
 
   /// MachineRegisterInfo used to create virtual registers.
   MachineRegisterInfo *MRI = nullptr;
 
-  const DataLayout *DL;
+  const DataLayout *DL = nullptr;
 
   /// Current target configuration. Controls how the pass handles errors.
-  const TargetPassConfig *TPC;
+  const TargetPassConfig *TPC = nullptr;
 
   CodeGenOpt::Level OptLevel;
 
   /// Current optimization remark emitter. Used to report failures.
   std::unique_ptr<OptimizationRemarkEmitter> ORE;
 
-  AAResults *AA;
-  AssumptionCache *AC;
-  const TargetLibraryInfo *LibInfo;
+  AAResults *AA = nullptr;
+  AssumptionCache *AC = nullptr;
+  const TargetLibraryInfo *LibInfo = nullptr;
   FunctionLoweringInfo FuncInfo;
 
   // True when either the Target Machine specifies no optimizations or the
diff --git a/llvm/include/llvm/CodeGen/GlobalISel/LoadStoreOpt.h b/llvm/include/llvm/CodeGen/GlobalISel/LoadStoreOpt.h
--- a/llvm/include/llvm/CodeGen/GlobalISel/LoadStoreOpt.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/LoadStoreOpt.h
@@ -69,11 +69,11 @@
   /// on the given MachineFunction.
   std::function<bool(const MachineFunction &)> DoNotRunPass;
 
-  MachineRegisterInfo *MRI;
-  const TargetLowering *TLI;
-  MachineFunction *MF;
-  AliasAnalysis *AA;
-  const LegalizerInfo *LI;
+  MachineRegisterInfo *MRI = nullptr;
+  const TargetLowering *TLI = nullptr;
+  MachineFunction *MF = nullptr;
+  AliasAnalysis *AA = nullptr;
+  const LegalizerInfo *LI = nullptr;
 
   MachineIRBuilder Builder;
 
diff --git a/llvm/include/llvm/CodeGen/GlobalISel/Localizer.h b/llvm/include/llvm/CodeGen/GlobalISel/Localizer.h
--- a/llvm/include/llvm/CodeGen/GlobalISel/Localizer.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/Localizer.h
@@ -51,9 +51,9 @@
 
   /// MRI contains all the register class/bank information that this
   /// pass uses and updates.
-  MachineRegisterInfo *MRI;
+  MachineRegisterInfo *MRI = nullptr;
   /// TTI used for getting remat costs for instructions.
-  TargetTransformInfo *TTI;
+  TargetTransformInfo *TTI = nullptr;
 
   /// Check if \p MOUse is used in the same basic block as \p Def.
   /// If the use is in the same block, we say it is local.
diff --git a/llvm/include/llvm/CodeGen/LatencyPriorityQueue.h b/llvm/include/llvm/CodeGen/LatencyPriorityQueue.h
--- a/llvm/include/llvm/CodeGen/LatencyPriorityQueue.h
+++ b/llvm/include/llvm/CodeGen/LatencyPriorityQueue.h
@@ -31,7 +31,7 @@
 
   class LatencyPriorityQueue : public SchedulingPriorityQueue {
     // SUnits - The SUnits for the current graph.
-    std::vector<SUnit> *SUnits;
+    std::vector<SUnit> *SUnits = nullptr;
 
     /// NumNodesSolelyBlocking - This vector contains, for every node in the
     /// Queue, the number of nodes that the node is the sole unscheduled
diff --git a/llvm/include/llvm/CodeGen/LiveIntervals.h b/llvm/include/llvm/CodeGen/LiveIntervals.h
--- a/llvm/include/llvm/CodeGen/LiveIntervals.h
+++ b/llvm/include/llvm/CodeGen/LiveIntervals.h
@@ -51,11 +51,11 @@
 class VirtRegMap;
 
   class LiveIntervals : public MachineFunctionPass {
-    MachineFunction* MF;
-    MachineRegisterInfo* MRI;
-    const TargetRegisterInfo* TRI;
-    const TargetInstrInfo *TII;
-    SlotIndexes* Indexes;
+    MachineFunction *MF = nullptr;
+    MachineRegisterInfo *MRI = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
+    SlotIndexes *Indexes = nullptr;
     MachineDominatorTree *DomTree = nullptr;
     LiveIntervalCalc *LICalc = nullptr;
 
diff --git a/llvm/include/llvm/CodeGen/LiveRegMatrix.h b/llvm/include/llvm/CodeGen/LiveRegMatrix.h
--- a/llvm/include/llvm/CodeGen/LiveRegMatrix.h
+++ b/llvm/include/llvm/CodeGen/LiveRegMatrix.h
@@ -38,9 +38,9 @@
 class VirtRegMap;
 
 class LiveRegMatrix : public MachineFunctionPass {
-  const TargetRegisterInfo *TRI;
-  LiveIntervals *LIS;
-  VirtRegMap *VRM;
+  const TargetRegisterInfo *TRI = nullptr;
+  LiveIntervals *LIS = nullptr;
+  VirtRegMap *VRM = nullptr;
 
   // UserTag changes whenever virtual registers have been modified.
   unsigned UserTag = 0;
diff --git a/llvm/include/llvm/CodeGen/LiveStacks.h b/llvm/include/llvm/CodeGen/LiveStacks.h
--- a/llvm/include/llvm/CodeGen/LiveStacks.h
+++ b/llvm/include/llvm/CodeGen/LiveStacks.h
@@ -33,7 +33,7 @@
 class TargetRegisterInfo;
 
 class LiveStacks : public MachineFunctionPass {
-  const TargetRegisterInfo *TRI;
+  const TargetRegisterInfo *TRI = nullptr;
 
   /// Special pool allocator for VNInfo's (LiveInterval val#).
   ///
diff --git a/llvm/include/llvm/CodeGen/LiveVariables.h b/llvm/include/llvm/CodeGen/LiveVariables.h
--- a/llvm/include/llvm/CodeGen/LiveVariables.h
+++ b/llvm/include/llvm/CodeGen/LiveVariables.h
@@ -124,11 +124,11 @@
   SparseBitVector<> PHIJoins;
 
 private:   // Intermediate data structures
-  MachineFunction *MF;
+  MachineFunction *MF = nullptr;
 
-  MachineRegisterInfo* MRI;
+  MachineRegisterInfo *MRI = nullptr;
 
-  const TargetRegisterInfo *TRI;
+  const TargetRegisterInfo *TRI = nullptr;
 
   // PhysRegInfo - Keep track of which instruction was the last def of a
   // physical register. This is a purely local property, because all physical
diff --git a/llvm/include/llvm/CodeGen/MIRFSDiscriminator.h b/llvm/include/llvm/CodeGen/MIRFSDiscriminator.h
--- a/llvm/include/llvm/CodeGen/MIRFSDiscriminator.h
+++ b/llvm/include/llvm/CodeGen/MIRFSDiscriminator.h
@@ -30,7 +30,7 @@
 
 using namespace sampleprof;
 class MIRAddFSDiscriminators : public MachineFunctionPass {
-  MachineFunction *MF;
+  MachineFunction *MF = nullptr;
   unsigned LowBit;
   unsigned HighBit;
 
diff --git a/llvm/include/llvm/CodeGen/MachineModuleInfo.h b/llvm/include/llvm/CodeGen/MachineModuleInfo.h
--- a/llvm/include/llvm/CodeGen/MachineModuleInfo.h
+++ b/llvm/include/llvm/CodeGen/MachineModuleInfo.h
@@ -84,7 +84,7 @@
   MCContext *ExternalContext = nullptr;
 
   /// This is the LLVM Module being worked on.
-  const Module *TheModule;
+  const Module *TheModule = nullptr;
 
   /// This is the object-file-format-specific implementation of
   /// MachineModuleInfoImpl, which lets targets accumulate whatever info they
diff --git a/llvm/include/llvm/CodeGen/MachinePipeliner.h b/llvm/include/llvm/CodeGen/MachinePipeliner.h
--- a/llvm/include/llvm/CodeGen/MachinePipeliner.h
+++ b/llvm/include/llvm/CodeGen/MachinePipeliner.h
@@ -69,7 +69,7 @@
   MachineOptimizationRemarkEmitter *ORE = nullptr;
   const MachineLoopInfo *MLI = nullptr;
   const MachineDominatorTree *MDT = nullptr;
-  const InstrItineraryData *InstrItins;
+  const InstrItineraryData *InstrItins = nullptr;
   const TargetInstrInfo *TII = nullptr;
   RegisterClassInfo RegClassInfo;
   bool disabledByPragma = false;
diff --git a/llvm/include/llvm/CodeGen/MachineSSAUpdater.h b/llvm/include/llvm/CodeGen/MachineSSAUpdater.h
--- a/llvm/include/llvm/CodeGen/MachineSSAUpdater.h
+++ b/llvm/include/llvm/CodeGen/MachineSSAUpdater.h
@@ -41,14 +41,14 @@
   void *AV = nullptr;
 
   /// VRC - Register class of the current virtual register.
-  const TargetRegisterClass *VRC;
+  const TargetRegisterClass *VRC = nullptr;
 
   /// InsertedPHIs - If this is non-null, the MachineSSAUpdater adds all PHI
   /// nodes that it creates to the vector.
   SmallVectorImpl<MachineInstr*> *InsertedPHIs;
 
-  const TargetInstrInfo *TII;
-  MachineRegisterInfo *MRI;
+  const TargetInstrInfo *TII = nullptr;
+  MachineRegisterInfo *MRI = nullptr;
 
 public:
   /// MachineSSAUpdater constructor.  If InsertedPHIs is specified, it will be
diff --git a/llvm/include/llvm/CodeGen/ModuloSchedule.h b/llvm/include/llvm/CodeGen/ModuloSchedule.h
--- a/llvm/include/llvm/CodeGen/ModuloSchedule.h
+++ b/llvm/include/llvm/CodeGen/ModuloSchedule.h
@@ -170,11 +170,11 @@
   MachineFunction &MF;
   const TargetSubtargetInfo &ST;
   MachineRegisterInfo &MRI;
-  const TargetInstrInfo *TII;
+  const TargetInstrInfo *TII = nullptr;
   LiveIntervals &LIS;
 
-  MachineBasicBlock *BB;
-  MachineBasicBlock *Preheader;
+  MachineBasicBlock *BB = nullptr;
+  MachineBasicBlock *Preheader = nullptr;
   MachineBasicBlock *NewKernel = nullptr;
   std::unique_ptr<TargetInstrInfo::PipelinerLoopInfo> LoopInfo;
 
@@ -297,13 +297,13 @@
   MachineFunction &MF;
   const TargetSubtargetInfo &ST;
   MachineRegisterInfo &MRI;
-  const TargetInstrInfo *TII;
-  LiveIntervals *LIS;
+  const TargetInstrInfo *TII = nullptr;
+  LiveIntervals *LIS = nullptr;
 
   /// The original loop block that gets rewritten in-place.
-  MachineBasicBlock *BB;
+  MachineBasicBlock *BB = nullptr;
   /// The original loop preheader.
-  MachineBasicBlock *Preheader;
+  MachineBasicBlock *Preheader = nullptr;
   /// All prolog and epilog blocks.
   SmallVector<MachineBasicBlock *, 4> Prologs, Epilogs;
   /// For every block, the stages that are produced.
diff --git a/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h b/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
--- a/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
+++ b/llvm/include/llvm/CodeGen/ReachingDefAnalysis.h
@@ -68,8 +68,8 @@
 /// This class provides the reaching def analysis.
 class ReachingDefAnalysis : public MachineFunctionPass {
 private:
-  MachineFunction *MF;
-  const TargetRegisterInfo *TRI;
+  MachineFunction *MF = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   LoopTraversal::TraversalOrder TraversedMBBOrder;
   unsigned NumRegUnits;
   /// Instruction that defined each register, relative to the beginning of the
diff --git a/llvm/include/llvm/CodeGen/RegisterScavenging.h b/llvm/include/llvm/CodeGen/RegisterScavenging.h
--- a/llvm/include/llvm/CodeGen/RegisterScavenging.h
+++ b/llvm/include/llvm/CodeGen/RegisterScavenging.h
@@ -32,9 +32,9 @@
 class TargetRegisterInfo;
 
 class RegScavenger {
-  const TargetRegisterInfo *TRI;
-  const TargetInstrInfo *TII;
-  MachineRegisterInfo* MRI;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  MachineRegisterInfo *MRI = nullptr;
   MachineBasicBlock *MBB = nullptr;
   MachineBasicBlock::iterator MBBI;
   unsigned NumRegUnits = 0;
diff --git a/llvm/include/llvm/CodeGen/RegisterUsageInfo.h b/llvm/include/llvm/CodeGen/RegisterUsageInfo.h
--- a/llvm/include/llvm/CodeGen/RegisterUsageInfo.h
+++ b/llvm/include/llvm/CodeGen/RegisterUsageInfo.h
@@ -63,7 +63,7 @@
   /// and 1 means content of register will be preserved around function call.
   DenseMap<const Function *, std::vector<uint32_t>> RegMasks;
 
-  const LLVMTargetMachine *TM;
+  const LLVMTargetMachine *TM = nullptr;
 };
 
 } // end namespace llvm
diff --git a/llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h b/llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
--- a/llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
+++ b/llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
@@ -119,7 +119,7 @@
   /// A ScheduleDAG for scheduling lists of MachineInstr.
   class ScheduleDAGInstrs : public ScheduleDAG {
   protected:
-    const MachineLoopInfo *MLI;
+    const MachineLoopInfo *MLI = nullptr;
     const MachineFrameInfo &MFI;
 
     /// TargetSchedModel provides an interface to the machine model.
@@ -143,7 +143,7 @@
     // ------------------------------------------------
 
     /// The block in which to insert instructions
-    MachineBasicBlock *BB;
+    MachineBasicBlock *BB = nullptr;
 
     /// The beginning of the range to be scheduled.
     MachineBasicBlock::iterator RegionBegin;
diff --git a/llvm/include/llvm/CodeGen/StackProtector.h b/llvm/include/llvm/CodeGen/StackProtector.h
--- a/llvm/include/llvm/CodeGen/StackProtector.h
+++ b/llvm/include/llvm/CodeGen/StackProtector.h
@@ -49,8 +49,8 @@
   const TargetLoweringBase *TLI = nullptr;
   Triple Trip;
 
-  Function *F;
-  Module *M;
+  Function *F = nullptr;
+  Module *M = nullptr;
 
   std::optional<DomTreeUpdater> DTU;
 
diff --git a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
--- a/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
+++ b/llvm/include/llvm/CodeGen/SwitchLoweringUtils.h
@@ -237,11 +237,11 @@
                               unsigned First, unsigned Last);
 
 struct SwitchWorkListItem {
-  MachineBasicBlock *MBB;
+  MachineBasicBlock *MBB = nullptr;
   CaseClusterIt FirstCluster;
   CaseClusterIt LastCluster;
-  const ConstantInt *GE;
-  const ConstantInt *LT;
+  const ConstantInt *GE = nullptr;
+  const ConstantInt *LT = nullptr;
   BranchProbability DefaultProb;
 };
 using SwitchWorkList = SmallVector<SwitchWorkListItem, 4>;
@@ -292,9 +292,9 @@
   virtual ~SwitchLowering() = default;
 
 private:
-  const TargetLowering *TLI;
-  const TargetMachine *TM;
-  const DataLayout *DL;
+  const TargetLowering *TLI = nullptr;
+  const TargetMachine *TM = nullptr;
+  const DataLayout *DL = nullptr;
   FunctionLoweringInfo &FuncInfo;
 };
 
diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -3318,7 +3318,7 @@
   /// register class is the largest legal super-reg register class of the
   /// register class of the specified type. e.g. On x86, i8, i16, and i32's
   /// representative class would be GR32.
-  const TargetRegisterClass *RepRegClassForVT[MVT::VALUETYPE_SIZE];
+  const TargetRegisterClass *RepRegClassForVT[MVT::VALUETYPE_SIZE] = {0};
 
   /// This indicates the "cost" of the "representative" register class for each
   /// ValueType. The cost is used by the scheduler to approximate register
diff --git a/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h b/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h
--- a/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h
+++ b/llvm/lib/CodeGen/AsmPrinter/DebugLocStream.h
@@ -49,7 +49,7 @@
   SmallVector<Entry, 32> Entries;
   SmallString<256> DWARFBytes;
   std::vector<std::string> Comments;
-  MCSymbol *Sym;
+  MCSymbol *Sym = nullptr;
 
   /// Only verbose textual output needs comments.  This will be set to
   /// true for that case, and false otherwise.
diff --git a/llvm/lib/CodeGen/BranchFolding.h b/llvm/lib/CodeGen/BranchFolding.h
--- a/llvm/lib/CodeGen/BranchFolding.h
+++ b/llvm/lib/CodeGen/BranchFolding.h
@@ -118,10 +118,10 @@
     bool EnableHoistCommonCode;
     bool UpdateLiveIns;
     unsigned MinCommonTailLength;
-    const TargetInstrInfo *TII;
-    const MachineRegisterInfo *MRI;
-    const TargetRegisterInfo *TRI;
-    MachineLoopInfo *MLI;
+    const TargetInstrInfo *TII = nullptr;
+    const MachineRegisterInfo *MRI = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    MachineLoopInfo *MLI = nullptr;
     LivePhysRegs LiveRegs;
 
   private:
diff --git a/llvm/lib/CodeGen/BranchRelaxation.cpp b/llvm/lib/CodeGen/BranchRelaxation.cpp
--- a/llvm/lib/CodeGen/BranchRelaxation.cpp
+++ b/llvm/lib/CodeGen/BranchRelaxation.cpp
@@ -81,9 +81,9 @@
   std::unique_ptr<RegScavenger> RS;
   LivePhysRegs LiveRegs;
 
-  MachineFunction *MF;
-  const TargetRegisterInfo *TRI;
-  const TargetInstrInfo *TII;
+  MachineFunction *MF = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
 
   bool relaxBranchInstructions();
   void scanFunction();
diff --git a/llvm/lib/CodeGen/BreakFalseDeps.cpp b/llvm/lib/CodeGen/BreakFalseDeps.cpp
--- a/llvm/lib/CodeGen/BreakFalseDeps.cpp
+++ b/llvm/lib/CodeGen/BreakFalseDeps.cpp
@@ -34,9 +34,9 @@
 
 class BreakFalseDeps : public MachineFunctionPass {
 private:
-  MachineFunction *MF;
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
+  MachineFunction *MF = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   RegisterClassInfo RegClassInfo;
 
   /// List of undefined register reads in this block in forward order.
@@ -45,7 +45,7 @@
   /// Storage for register unit liveness.
   LivePhysRegs LiveRegSet;
 
-  ReachingDefAnalysis *RDA;
+  ReachingDefAnalysis *RDA = nullptr;
 
 public:
   static char ID; // Pass identification, replacement for typeid
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -298,16 +298,16 @@
 
 class CodeGenPrepare : public FunctionPass {
   const TargetMachine *TM = nullptr;
-  const TargetSubtargetInfo *SubtargetInfo;
+  const TargetSubtargetInfo *SubtargetInfo = nullptr;
   const TargetLowering *TLI = nullptr;
-  const TargetRegisterInfo *TRI;
+  const TargetRegisterInfo *TRI = nullptr;
   const TargetTransformInfo *TTI = nullptr;
   const BasicBlockSectionsProfileReader *BBSectionsProfileReader = nullptr;
-  const TargetLibraryInfo *TLInfo;
-  const LoopInfo *LI;
+  const TargetLibraryInfo *TLInfo = nullptr;
+  const LoopInfo *LI = nullptr;
   std::unique_ptr<BlockFrequencyInfo> BFI;
   std::unique_ptr<BranchProbabilityInfo> BPI;
-  ProfileSummaryInfo *PSI;
+  ProfileSummaryInfo *PSI = nullptr;
 
   /// As we scan instructions optimizing them, this is the next instruction
   /// to optimize. Transforms that can invalidate this should update it.
diff --git a/llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp b/llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp
--- a/llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp
+++ b/llvm/lib/CodeGen/ComplexDeinterleavingPass.cpp
@@ -197,8 +197,8 @@
   explicit ComplexDeinterleavingGraph(const TargetLowering *tl) : TL(tl) {}
 
 private:
-  const TargetLowering *TL;
-  Instruction *RootValue;
+  const TargetLowering *TL = nullptr;
+  Instruction *RootValue = nullptr;
   NodePtr RootNode;
   SmallVector<NodePtr> CompositeNodes;
   SmallPtrSet<Instruction *, 16> AllInstructions;
diff --git a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
--- a/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
+++ b/llvm/lib/CodeGen/DeadMachineInstructionElim.cpp
@@ -31,8 +31,8 @@
   class DeadMachineInstructionElim : public MachineFunctionPass {
     bool runOnMachineFunction(MachineFunction &MF) override;
 
-    const MachineRegisterInfo *MRI;
-    const TargetInstrInfo *TII;
+    const MachineRegisterInfo *MRI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
     LiveRegUnits LivePhysRegs;
 
   public:
diff --git a/llvm/lib/CodeGen/DetectDeadLanes.cpp b/llvm/lib/CodeGen/DetectDeadLanes.cpp
--- a/llvm/lib/CodeGen/DetectDeadLanes.cpp
+++ b/llvm/lib/CodeGen/DetectDeadLanes.cpp
@@ -403,8 +403,8 @@
   bool isUndefInput(const DeadLaneDetector &DLD, const MachineOperand &MO,
                     bool *CrossCopy) const;
 
-  const MachineRegisterInfo *MRI;
-  const TargetRegisterInfo *TRI;
+  const MachineRegisterInfo *MRI = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
 };
 
 } // end anonymous namespace
diff --git a/llvm/lib/CodeGen/EarlyIfConversion.cpp b/llvm/lib/CodeGen/EarlyIfConversion.cpp
--- a/llvm/lib/CodeGen/EarlyIfConversion.cpp
+++ b/llvm/lib/CodeGen/EarlyIfConversion.cpp
@@ -760,14 +760,14 @@
 
 namespace {
 class EarlyIfConverter : public MachineFunctionPass {
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   MCSchedModel SchedModel;
-  MachineRegisterInfo *MRI;
-  MachineDominatorTree *DomTree;
-  MachineLoopInfo *Loops;
-  MachineTraceMetrics *Traces;
-  MachineTraceMetrics::Ensemble *MinInstr;
+  MachineRegisterInfo *MRI = nullptr;
+  MachineDominatorTree *DomTree = nullptr;
+  MachineLoopInfo *Loops = nullptr;
+  MachineTraceMetrics *Traces = nullptr;
+  MachineTraceMetrics::Ensemble *MinInstr = nullptr;
   SSAIfConv IfConv;
 
 public:
@@ -1084,13 +1084,13 @@
 
 namespace {
 class EarlyIfPredicator : public MachineFunctionPass {
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   TargetSchedModel SchedModel;
-  MachineRegisterInfo *MRI;
-  MachineDominatorTree *DomTree;
-  MachineBranchProbabilityInfo *MBPI;
-  MachineLoopInfo *Loops;
+  MachineRegisterInfo *MRI = nullptr;
+  MachineDominatorTree *DomTree = nullptr;
+  MachineBranchProbabilityInfo *MBPI = nullptr;
+  MachineLoopInfo *Loops = nullptr;
   SSAIfConv IfConv;
 
 public:
diff --git a/llvm/lib/CodeGen/ExpandMemCmp.cpp b/llvm/lib/CodeGen/ExpandMemCmp.cpp
--- a/llvm/lib/CodeGen/ExpandMemCmp.cpp
+++ b/llvm/lib/CodeGen/ExpandMemCmp.cpp
@@ -71,7 +71,7 @@
     ResultBlock() = default;
   };
 
-  CallInst *const CI;
+  CallInst *const CI = nullptr;
   ResultBlock ResBlock;
   const uint64_t Size;
   unsigned MaxLoadSize = 0;
@@ -82,7 +82,7 @@
   PHINode *PhiRes = nullptr;
   const bool IsUsedForZeroCmp;
   const DataLayout &DL;
-  DomTreeUpdater *DTU;
+  DomTreeUpdater *DTU = nullptr;
   IRBuilder<> Builder;
   // Represents the decomposition in blocks of the expansion. For example,
   // comparing 33 bytes on X86+sse can be done with 2x16-byte loads and
diff --git a/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp b/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp
--- a/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp
+++ b/llvm/lib/CodeGen/ExpandPostRAPseudos.cpp
@@ -28,8 +28,8 @@
 namespace {
 struct ExpandPostRA : public MachineFunctionPass {
 private:
-  const TargetRegisterInfo *TRI;
-  const TargetInstrInfo *TII;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
 
 public:
   static char ID; // Pass identification, replacement for typeid
diff --git a/llvm/lib/CodeGen/GCRootLowering.cpp b/llvm/lib/CodeGen/GCRootLowering.cpp
--- a/llvm/lib/CodeGen/GCRootLowering.cpp
+++ b/llvm/lib/CodeGen/GCRootLowering.cpp
@@ -52,8 +52,8 @@
 /// in the machine code. It inserts labels at safe points and populates a
 /// GCMetadata record for each function.
 class GCMachineCodeAnalysis : public MachineFunctionPass {
-  GCFunctionInfo *FI;
-  const TargetInstrInfo *TII;
+  GCFunctionInfo *FI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
 
   void FindSafePoints(MachineFunction &MF);
   void VisitCallPoint(MachineBasicBlock::iterator CI);
diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -189,11 +189,11 @@
     std::vector<BBInfo> BBAnalysis;
     TargetSchedModel SchedModel;
 
-    const TargetLoweringBase *TLI;
-    const TargetInstrInfo *TII;
-    const TargetRegisterInfo *TRI;
-    const MachineBranchProbabilityInfo *MBPI;
-    MachineRegisterInfo *MRI;
+    const TargetLoweringBase *TLI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    const MachineBranchProbabilityInfo *MBPI = nullptr;
+    MachineRegisterInfo *MRI = nullptr;
 
     LivePhysRegs Redefs;
 
diff --git a/llvm/lib/CodeGen/InlineSpiller.cpp b/llvm/lib/CodeGen/InlineSpiller.cpp
--- a/llvm/lib/CodeGen/InlineSpiller.cpp
+++ b/llvm/lib/CodeGen/InlineSpiller.cpp
@@ -165,8 +165,8 @@
   const MachineBlockFrequencyInfo &MBFI;
 
   // Variables that are valid during spill(), but used by multiple methods.
-  LiveRangeEdit *Edit;
-  LiveInterval *StackInt;
+  LiveRangeEdit *Edit = nullptr;
+  LiveInterval *StackInt = nullptr;
   int StackSlot;
   Register Original;
 
diff --git a/llvm/lib/CodeGen/InterferenceCache.h b/llvm/lib/CodeGen/InterferenceCache.h
--- a/llvm/lib/CodeGen/InterferenceCache.h
+++ b/llvm/lib/CodeGen/InterferenceCache.h
@@ -54,7 +54,7 @@
     unsigned RefCount = 0;
 
     /// MF - The current function.
-    MachineFunction *MF;
+    MachineFunction *MF = nullptr;
 
     /// Indexes - Mapping block numbers to SlotIndex ranges.
     SlotIndexes *Indexes = nullptr;
diff --git a/llvm/lib/CodeGen/LiveDebugValues/LiveDebugValues.cpp b/llvm/lib/CodeGen/LiveDebugValues/LiveDebugValues.cpp
--- a/llvm/lib/CodeGen/LiveDebugValues/LiveDebugValues.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/LiveDebugValues.cpp
@@ -81,7 +81,7 @@
 private:
   std::unique_ptr<LDVImpl> InstrRefImpl;
   std::unique_ptr<LDVImpl> VarLocImpl;
-  TargetPassConfig *TPC;
+  TargetPassConfig *TPC = nullptr;
   MachineDominatorTree MDT;
 };
 } // namespace
diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -353,15 +353,15 @@
 
   /// Pair struct containing basic block and taildup profitability
   struct BlockAndTailDupResult {
-    MachineBasicBlock *BB;
+    MachineBasicBlock *BB = nullptr;
     bool ShouldTailDup;
   };
 
   /// Triple struct containing edge weight and the edge.
   struct WeightedEdge {
     BlockFrequency Weight;
-    MachineBasicBlock *Src;
-    MachineBasicBlock *Dest;
+    MachineBasicBlock *Src = nullptr;
+    MachineBasicBlock *Dest = nullptr;
   };
 
   /// work lists of blocks that are ready to be laid out
@@ -372,32 +372,32 @@
   DenseMap<const MachineBasicBlock *, BlockAndTailDupResult> ComputedEdges;
 
   /// Machine Function
-  MachineFunction *F;
+  MachineFunction *F = nullptr;
 
   /// A handle to the branch probability pass.
-  const MachineBranchProbabilityInfo *MBPI;
+  const MachineBranchProbabilityInfo *MBPI = nullptr;
 
   /// A handle to the function-wide block frequency pass.
   std::unique_ptr<MBFIWrapper> MBFI;
 
   /// A handle to the loop info.
-  MachineLoopInfo *MLI;
+  MachineLoopInfo *MLI = nullptr;
 
   /// Preferred loop exit.
   /// Member variable for convenience. It may be removed by duplication deep
   /// in the call stack.
-  MachineBasicBlock *PreferredLoopExit;
+  MachineBasicBlock *PreferredLoopExit = nullptr;
 
   /// A handle to the target's instruction info.
-  const TargetInstrInfo *TII;
+  const TargetInstrInfo *TII = nullptr;
 
   /// A handle to the target's lowering info.
-  const TargetLoweringBase *TLI;
+  const TargetLoweringBase *TLI = nullptr;
 
   /// A handle to the post dominator tree.
-  MachinePostDominatorTree *MPDT;
+  MachinePostDominatorTree *MPDT = nullptr;
 
-  ProfileSummaryInfo *PSI;
+  ProfileSummaryInfo *PSI = nullptr;
 
   /// Duplicator used to duplicate tails during placement.
   ///
diff --git a/llvm/lib/CodeGen/MachineCSE.cpp b/llvm/lib/CodeGen/MachineCSE.cpp
--- a/llvm/lib/CodeGen/MachineCSE.cpp
+++ b/llvm/lib/CodeGen/MachineCSE.cpp
@@ -68,12 +68,12 @@
 namespace {
 
   class MachineCSE : public MachineFunctionPass {
-    const TargetInstrInfo *TII;
-    const TargetRegisterInfo *TRI;
-    AliasAnalysis *AA;
-    MachineDominatorTree *DT;
-    MachineRegisterInfo *MRI;
-    MachineBlockFrequencyInfo *MBFI;
+    const TargetInstrInfo *TII = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    AliasAnalysis *AA = nullptr;
+    MachineDominatorTree *DT = nullptr;
+    MachineRegisterInfo *MRI = nullptr;
+    MachineBlockFrequencyInfo *MBFI = nullptr;
 
   public:
     static char ID; // Pass identification
diff --git a/llvm/lib/CodeGen/MachineCombiner.cpp b/llvm/lib/CodeGen/MachineCombiner.cpp
--- a/llvm/lib/CodeGen/MachineCombiner.cpp
+++ b/llvm/lib/CodeGen/MachineCombiner.cpp
@@ -63,16 +63,16 @@
 
 namespace {
 class MachineCombiner : public MachineFunctionPass {
-  const TargetSubtargetInfo *STI;
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
+  const TargetSubtargetInfo *STI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
   MCSchedModel SchedModel;
-  MachineRegisterInfo *MRI;
-  MachineLoopInfo *MLI; // Current MachineLoopInfo
-  MachineTraceMetrics *Traces;
-  MachineTraceMetrics::Ensemble *TraceEnsemble;
-  MachineBlockFrequencyInfo *MBFI;
-  ProfileSummaryInfo *PSI;
+  MachineRegisterInfo *MRI = nullptr;
+  MachineLoopInfo *MLI = nullptr; // Current MachineLoopInfo
+  MachineTraceMetrics *Traces = nullptr;
+  MachineTraceMetrics::Ensemble *TraceEnsemble = nullptr;
+  MachineBlockFrequencyInfo *MBFI = nullptr;
+  ProfileSummaryInfo *PSI = nullptr;
   RegisterClassInfo RegClassInfo;
 
   TargetSchedModel TSchedModel;
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
--- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp
+++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
@@ -339,9 +339,9 @@
 };
 
 class MachineCopyPropagation : public MachineFunctionPass {
-  const TargetRegisterInfo *TRI;
-  const TargetInstrInfo *TII;
-  const MachineRegisterInfo *MRI;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  const MachineRegisterInfo *MRI = nullptr;
 
   // Return true if this is a copy instruction and false otherwise.
   bool UseCopyInstr;
diff --git a/llvm/lib/CodeGen/MachineSink.cpp b/llvm/lib/CodeGen/MachineSink.cpp
--- a/llvm/lib/CodeGen/MachineSink.cpp
+++ b/llvm/lib/CodeGen/MachineSink.cpp
@@ -115,15 +115,15 @@
 namespace {
 
   class MachineSinking : public MachineFunctionPass {
-    const TargetInstrInfo *TII;
-    const TargetRegisterInfo *TRI;
-    MachineRegisterInfo  *MRI;     // Machine register information
-    MachineDominatorTree *DT;      // Machine dominator tree
-    MachinePostDominatorTree *PDT; // Machine post dominator tree
-    MachineCycleInfo *CI;
-    MachineBlockFrequencyInfo *MBFI;
-    const MachineBranchProbabilityInfo *MBPI;
-    AliasAnalysis *AA;
+    const TargetInstrInfo *TII = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    MachineRegisterInfo *MRI = nullptr;      // Machine register information
+    MachineDominatorTree *DT = nullptr;      // Machine dominator tree
+    MachinePostDominatorTree *PDT = nullptr; // Machine post dominator tree
+    MachineCycleInfo *CI = nullptr;
+    MachineBlockFrequencyInfo *MBFI = nullptr;
+    const MachineBranchProbabilityInfo *MBPI = nullptr;
+    AliasAnalysis *AA = nullptr;
     RegisterClassInfo RegClassInfo;
 
     // Remember which edges have been considered for breaking.
diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -95,12 +95,12 @@
 
     Pass *const PASS;
     const char *Banner;
-    const MachineFunction *MF;
-    const TargetMachine *TM;
-    const TargetInstrInfo *TII;
-    const TargetRegisterInfo *TRI;
-    const MachineRegisterInfo *MRI;
-    const RegisterBankInfo *RBI;
+    const MachineFunction *MF = nullptr;
+    const TargetMachine *TM = nullptr;
+    const TargetInstrInfo *TII = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    const MachineRegisterInfo *MRI = nullptr;
+    const RegisterBankInfo *RBI = nullptr;
 
     unsigned foundErrors;
 
@@ -115,8 +115,8 @@
     using RegMap = DenseMap<Register, const MachineInstr *>;
     using BlockSet = SmallPtrSet<const MachineBasicBlock *, 8>;
 
-    const MachineInstr *FirstNonPHI;
-    const MachineInstr *FirstTerminator;
+    const MachineInstr *FirstNonPHI = nullptr;
+    const MachineInstr *FirstTerminator = nullptr;
     BlockSet FunctionBlocks;
 
     BitVector regsReserved;
@@ -208,10 +208,10 @@
     }
 
     // Analysis information if available
-    LiveVariables *LiveVars;
-    LiveIntervals *LiveInts;
-    LiveStacks *LiveStks;
-    SlotIndexes *Indexes;
+    LiveVariables *LiveVars = nullptr;
+    LiveIntervals *LiveInts = nullptr;
+    LiveStacks *LiveStks = nullptr;
+    SlotIndexes *Indexes = nullptr;
 
     void visitMachineFunctionBefore();
     void visitMachineBasicBlockBefore(const MachineBasicBlock *MBB);
diff --git a/llvm/lib/CodeGen/OptimizePHIs.cpp b/llvm/lib/CodeGen/OptimizePHIs.cpp
--- a/llvm/lib/CodeGen/OptimizePHIs.cpp
+++ b/llvm/lib/CodeGen/OptimizePHIs.cpp
@@ -34,8 +34,8 @@
 namespace {
 
   class OptimizePHIs : public MachineFunctionPass {
-    MachineRegisterInfo *MRI;
-    const TargetInstrInfo *TII;
+    MachineRegisterInfo *MRI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
 
   public:
     static char ID; // Pass identification
diff --git a/llvm/lib/CodeGen/PHIElimination.cpp b/llvm/lib/CodeGen/PHIElimination.cpp
--- a/llvm/lib/CodeGen/PHIElimination.cpp
+++ b/llvm/lib/CodeGen/PHIElimination.cpp
@@ -63,9 +63,9 @@
 namespace {
 
   class PHIElimination : public MachineFunctionPass {
-    MachineRegisterInfo *MRI; // Machine register information
-    LiveVariables *LV;
-    LiveIntervals *LIS;
+    MachineRegisterInfo *MRI = nullptr; // Machine register information
+    LiveVariables *LV = nullptr;
+    LiveIntervals *LIS = nullptr;
 
   public:
     static char ID; // Pass identification, replacement for typeid
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
--- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
@@ -150,11 +150,11 @@
   class RecurrenceInstr;
 
   class PeepholeOptimizer : public MachineFunctionPass {
-    const TargetInstrInfo *TII;
-    const TargetRegisterInfo *TRI;
-    MachineRegisterInfo *MRI;
-    MachineDominatorTree *DT;  // Machine dominator tree
-    MachineLoopInfo *MLI;
+    const TargetInstrInfo *TII = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    MachineRegisterInfo *MRI = nullptr;
+    MachineDominatorTree *DT = nullptr; // Machine dominator tree
+    MachineLoopInfo *MLI = nullptr;
 
   public:
     static char ID; // Pass identification
diff --git a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
--- a/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
+++ b/llvm/lib/CodeGen/ProcessImplicitDefs.cpp
@@ -27,9 +27,9 @@
 /// Process IMPLICIT_DEF instructions and make sure there is one implicit_def
 /// for each use. Add isUndef marker to implicit_def defs and their uses.
 class ProcessImplicitDefs : public MachineFunctionPass {
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
-  MachineRegisterInfo *MRI;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
+  MachineRegisterInfo *MRI = nullptr;
 
   SmallSetVector<MachineInstr*, 16> WorkList;
 
diff --git a/llvm/lib/CodeGen/PrologEpilogInserter.cpp b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
--- a/llvm/lib/CodeGen/PrologEpilogInserter.cpp
+++ b/llvm/lib/CodeGen/PrologEpilogInserter.cpp
@@ -96,7 +96,7 @@
   bool runOnMachineFunction(MachineFunction &MF) override;
 
 private:
-  RegScavenger *RS;
+  RegScavenger *RS = nullptr;
 
   // MinCSFrameIndex, MaxCSFrameIndex - Keeps the range of callee saved
   // stack frame indexes.
diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -75,15 +75,15 @@
     }
 
   private:
-    MachineFrameInfo *MFI;
-    MachineRegisterInfo *MRI;
-    const TargetRegisterInfo *TRI;
-    const TargetInstrInfo *TII;
+    MachineFrameInfo *MFI = nullptr;
+    MachineRegisterInfo *MRI = nullptr;
+    const TargetRegisterInfo *TRI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
     RegisterClassInfo RegClassInfo;
     const RegClassFilterFunc ShouldAllocateClass;
 
     /// Basic block currently being allocated.
-    MachineBasicBlock *MBB;
+    MachineBasicBlock *MBB = nullptr;
 
     /// Maps virtual regs to the frame index where these values are spilled.
     IndexedMap<int, VirtReg2IndexFunctor> StackSlotForVirtReg;
diff --git a/llvm/lib/CodeGen/RegAllocGreedy.h b/llvm/lib/CodeGen/RegAllocGreedy.h
--- a/llvm/lib/CodeGen/RegAllocGreedy.h
+++ b/llvm/lib/CodeGen/RegAllocGreedy.h
@@ -166,20 +166,20 @@
       SmallVector<std::pair<const LiveInterval *, MCRegister>, 8>;
 
   // context
-  MachineFunction *MF;
+  MachineFunction *MF = nullptr;
 
   // Shortcuts to some useful interface.
-  const TargetInstrInfo *TII;
+  const TargetInstrInfo *TII = nullptr;
 
   // analyses
-  SlotIndexes *Indexes;
-  MachineBlockFrequencyInfo *MBFI;
-  MachineDominatorTree *DomTree;
-  MachineLoopInfo *Loops;
-  MachineOptimizationRemarkEmitter *ORE;
-  EdgeBundles *Bundles;
-  SpillPlacement *SpillPlacer;
-  LiveDebugVariables *DebugVars;
+  SlotIndexes *Indexes = nullptr;
+  MachineBlockFrequencyInfo *MBFI = nullptr;
+  MachineDominatorTree *DomTree = nullptr;
+  MachineLoopInfo *Loops = nullptr;
+  MachineOptimizationRemarkEmitter *ORE = nullptr;
+  EdgeBundles *Bundles = nullptr;
+  SpillPlacement *SpillPlacer = nullptr;
+  LiveDebugVariables *DebugVars = nullptr;
 
   // state
   std::unique_ptr<Spiller> SpillerInstance;
diff --git a/llvm/lib/CodeGen/SelectOptimize.cpp b/llvm/lib/CodeGen/SelectOptimize.cpp
--- a/llvm/lib/CodeGen/SelectOptimize.cpp
+++ b/llvm/lib/CodeGen/SelectOptimize.cpp
@@ -98,15 +98,15 @@
 
 class SelectOptimize : public FunctionPass {
   const TargetMachine *TM = nullptr;
-  const TargetSubtargetInfo *TSI;
+  const TargetSubtargetInfo *TSI = nullptr;
   const TargetLowering *TLI = nullptr;
   const TargetTransformInfo *TTI = nullptr;
-  const LoopInfo *LI;
-  DominatorTree *DT;
+  const LoopInfo *LI = nullptr;
+  DominatorTree *DT = nullptr;
   std::unique_ptr<BlockFrequencyInfo> BFI;
   std::unique_ptr<BranchProbabilityInfo> BPI;
-  ProfileSummaryInfo *PSI;
-  OptimizationRemarkEmitter *ORE;
+  ProfileSummaryInfo *PSI = nullptr;
+  OptimizationRemarkEmitter *ORE = nullptr;
   TargetSchedModel TSchedModel;
 
 public:
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
@@ -1744,12 +1744,12 @@
   bool SrcOrder;
 
   // SUnits - The SUnits for the current graph.
-  std::vector<SUnit> *SUnits;
+  std::vector<SUnit> *SUnits = nullptr;
 
   MachineFunction &MF;
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
-  const TargetLowering *TLI;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetLowering *TLI = nullptr;
   ScheduleDAGRRList *scheduleDAG = nullptr;
 
   // SethiUllmanNumbers - The SethiUllman number for each node.
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
@@ -247,7 +247,7 @@
   SelectionDAG &DAG;
   AAResults *AA = nullptr;
   AssumptionCache *AC = nullptr;
-  const TargetLibraryInfo *LibInfo;
+  const TargetLibraryInfo *LibInfo = nullptr;
 
   class SDAGSwitchLowering : public SwitchCG::SwitchLowering {
   public:
@@ -261,7 +261,7 @@
     }
 
   private:
-    SelectionDAGBuilder *SDB;
+    SelectionDAGBuilder *SDB = nullptr;
   };
 
   // Data related to deferred switch lowerings. Used to construct additional
@@ -283,7 +283,7 @@
   SwiftErrorValueTracking &SwiftError;
 
   /// Garbage collection metadata for the function.
-  GCFunctionInfo *GFI;
+  GCFunctionInfo *GFI = nullptr;
 
   /// Map a landing pad to the call site indexes.
   DenseMap<MachineBasicBlock *, SmallVector<unsigned, 4>> LPadToCallSiteMap;
@@ -292,7 +292,7 @@
   /// a tail call. In this case, no subsequent DAG nodes should be created.
   bool HasTailCall = false;
 
-  LLVMContext *Context;
+  LLVMContext *Context = nullptr;
 
   SelectionDAGBuilder(SelectionDAG &dag, FunctionLoweringInfo &funcinfo,
                       SwiftErrorValueTracking &swifterror, CodeGenOpt::Level ol)
diff --git a/llvm/lib/CodeGen/ShrinkWrap.cpp b/llvm/lib/CodeGen/ShrinkWrap.cpp
--- a/llvm/lib/CodeGen/ShrinkWrap.cpp
+++ b/llvm/lib/CodeGen/ShrinkWrap.cpp
@@ -110,26 +110,26 @@
 class ShrinkWrap : public MachineFunctionPass {
   /// Hold callee-saved information.
   RegisterClassInfo RCI;
-  MachineDominatorTree *MDT;
-  MachinePostDominatorTree *MPDT;
+  MachineDominatorTree *MDT = nullptr;
+  MachinePostDominatorTree *MPDT = nullptr;
 
   /// Current safe point found for the prologue.
   /// The prologue will be inserted before the first instruction
   /// in this basic block.
-  MachineBasicBlock *Save;
+  MachineBasicBlock *Save = nullptr;
 
   /// Current safe point found for the epilogue.
   /// The epilogue will be inserted before the first terminator instruction
   /// in this basic block.
-  MachineBasicBlock *Restore;
+  MachineBasicBlock *Restore = nullptr;
 
   /// Hold the information of the basic block frequency.
   /// Use to check the profitability of the new points.
-  MachineBlockFrequencyInfo *MBFI;
+  MachineBlockFrequencyInfo *MBFI = nullptr;
 
   /// Hold the loop information. Used to determine if Save and Restore
   /// are in the same loop.
-  MachineLoopInfo *MLI;
+  MachineLoopInfo *MLI = nullptr;
 
   // Emit remarks.
   MachineOptimizationRemarkEmitter *ORE = nullptr;
@@ -147,7 +147,7 @@
   Register SP;
 
   /// Entry block.
-  const MachineBasicBlock *Entry;
+  const MachineBasicBlock *Entry = nullptr;
 
   using SetOfRegs = SmallSetVector<unsigned, 16>;
 
@@ -155,7 +155,7 @@
   mutable SetOfRegs CurrentCSRs;
 
   /// Current MachineFunction.
-  MachineFunction *MachineFunc;
+  MachineFunction *MachineFunc = nullptr;
 
   /// Check if \p MI uses or defines a callee-saved register or
   /// a frame index. If this is the case, this means \p MI must happen
diff --git a/llvm/lib/CodeGen/SjLjEHPrepare.cpp b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
--- a/llvm/lib/CodeGen/SjLjEHPrepare.cpp
+++ b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
@@ -38,21 +38,21 @@
 
 namespace {
 class SjLjEHPrepare : public FunctionPass {
-  IntegerType *DataTy;
-  Type *doubleUnderDataTy;
-  Type *doubleUnderJBufTy;
-  Type *FunctionContextTy;
+  IntegerType *DataTy = nullptr;
+  Type *doubleUnderDataTy = nullptr;
+  Type *doubleUnderJBufTy = nullptr;
+  Type *FunctionContextTy = nullptr;
   FunctionCallee RegisterFn;
   FunctionCallee UnregisterFn;
-  Function *BuiltinSetupDispatchFn;
-  Function *FrameAddrFn;
-  Function *StackAddrFn;
-  Function *StackRestoreFn;
-  Function *LSDAAddrFn;
-  Function *CallSiteFn;
-  Function *FuncCtxFn;
-  AllocaInst *FuncCtx;
-  const TargetMachine *TM;
+  Function *BuiltinSetupDispatchFn = nullptr;
+  Function *FrameAddrFn = nullptr;
+  Function *StackAddrFn = nullptr;
+  Function *StackRestoreFn = nullptr;
+  Function *LSDAAddrFn = nullptr;
+  Function *CallSiteFn = nullptr;
+  Function *FuncCtxFn = nullptr;
+  AllocaInst *FuncCtx = nullptr;
+  const TargetMachine *TM = nullptr;
 
 public:
   static char ID; // Pass identification, replacement for typeid
diff --git a/llvm/lib/CodeGen/SpillPlacement.h b/llvm/lib/CodeGen/SpillPlacement.h
--- a/llvm/lib/CodeGen/SpillPlacement.h
+++ b/llvm/lib/CodeGen/SpillPlacement.h
@@ -42,15 +42,15 @@
 
 class SpillPlacement : public MachineFunctionPass {
   struct Node;
-  const MachineFunction *MF;
-  const EdgeBundles *bundles;
-  const MachineLoopInfo *loops;
-  const MachineBlockFrequencyInfo *MBFI;
+  const MachineFunction *MF = nullptr;
+  const EdgeBundles *bundles = nullptr;
+  const MachineLoopInfo *loops = nullptr;
+  const MachineBlockFrequencyInfo *MBFI = nullptr;
   Node *nodes = nullptr;
 
   // Nodes that are active in the current computation. Owned by the prepare()
   // caller.
-  BitVector *ActiveNodes;
+  BitVector *ActiveNodes = nullptr;
 
   // Nodes with active links. Populated by scanActiveBundles.
   SmallVector<unsigned, 8> Linked;
diff --git a/llvm/lib/CodeGen/StackColoring.cpp b/llvm/lib/CodeGen/StackColoring.cpp
--- a/llvm/lib/CodeGen/StackColoring.cpp
+++ b/llvm/lib/CodeGen/StackColoring.cpp
@@ -407,8 +407,8 @@
 /// StackColoring - A machine pass for merging disjoint stack allocations,
 /// marked by the LIFETIME_START and LIFETIME_END pseudo instructions.
 class StackColoring : public MachineFunctionPass {
-  MachineFrameInfo *MFI;
-  MachineFunction *MF;
+  MachineFrameInfo *MFI = nullptr;
+  MachineFunction *MF = nullptr;
 
   /// A class representing liveness information for a single basic block.
   /// Each bit in the BitVector represents the liveness property
@@ -448,7 +448,7 @@
   VNInfo::Allocator VNInfoAllocator;
 
   /// SlotIndex analysis object.
-  SlotIndexes *Indexes;
+  SlotIndexes *Indexes = nullptr;
 
   /// The list of lifetime markers found. These markers are to be removed
   /// once the coloring is done.
diff --git a/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
--- a/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
+++ b/llvm/lib/CodeGen/StackMapLivenessAnalysis.cpp
@@ -48,7 +48,7 @@
 /// information provided by this pass is optional and not required by the
 /// aformentioned intrinsic to function.
 class StackMapLiveness : public MachineFunctionPass {
-  const TargetRegisterInfo *TRI;
+  const TargetRegisterInfo *TRI = nullptr;
   LivePhysRegs LiveRegs;
 
 public:
diff --git a/llvm/lib/CodeGen/StackSlotColoring.cpp b/llvm/lib/CodeGen/StackSlotColoring.cpp
--- a/llvm/lib/CodeGen/StackSlotColoring.cpp
+++ b/llvm/lib/CodeGen/StackSlotColoring.cpp
@@ -59,10 +59,10 @@
 namespace {
 
   class StackSlotColoring : public MachineFunctionPass {
-    LiveStacks* LS;
-    MachineFrameInfo *MFI;
-    const TargetInstrInfo  *TII;
-    const MachineBlockFrequencyInfo *MBFI;
+    LiveStacks *LS = nullptr;
+    MachineFrameInfo *MFI = nullptr;
+    const TargetInstrInfo *TII = nullptr;
+    const MachineBlockFrequencyInfo *MBFI = nullptr;
 
     // SSIntervals - Spill slot intervals.
     std::vector<LiveInterval*> SSIntervals;
diff --git a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
--- a/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
+++ b/llvm/lib/CodeGen/TwoAddressInstructionPass.cpp
@@ -87,18 +87,18 @@
 namespace {
 
 class TwoAddressInstructionPass : public MachineFunctionPass {
-  MachineFunction *MF;
-  const TargetInstrInfo *TII;
-  const TargetRegisterInfo *TRI;
-  const InstrItineraryData *InstrItins;
-  MachineRegisterInfo *MRI;
-  LiveVariables *LV;
-  LiveIntervals *LIS;
-  AliasAnalysis *AA;
+  MachineFunction *MF = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
+  const InstrItineraryData *InstrItins = nullptr;
+  MachineRegisterInfo *MRI = nullptr;
+  LiveVariables *LV = nullptr;
+  LiveIntervals *LIS = nullptr;
+  AliasAnalysis *AA = nullptr;
   CodeGenOpt::Level OptLevel;
 
   // The current basic block being processed.
-  MachineBasicBlock *MBB;
+  MachineBasicBlock *MBB = nullptr;
 
   // Keep track the distance of a MI from the start of the current basic block.
   DenseMap<MachineInstr*, unsigned> DistanceMap;
diff --git a/llvm/lib/CodeGen/VirtRegMap.cpp b/llvm/lib/CodeGen/VirtRegMap.cpp
--- a/llvm/lib/CodeGen/VirtRegMap.cpp
+++ b/llvm/lib/CodeGen/VirtRegMap.cpp
@@ -181,14 +181,14 @@
 namespace {
 
 class VirtRegRewriter : public MachineFunctionPass {
-  MachineFunction *MF;
-  const TargetRegisterInfo *TRI;
-  const TargetInstrInfo *TII;
-  MachineRegisterInfo *MRI;
-  SlotIndexes *Indexes;
-  LiveIntervals *LIS;
-  VirtRegMap *VRM;
-  LiveDebugVariables *DebugVars;
+  MachineFunction *MF = nullptr;
+  const TargetRegisterInfo *TRI = nullptr;
+  const TargetInstrInfo *TII = nullptr;
+  MachineRegisterInfo *MRI = nullptr;
+  SlotIndexes *Indexes = nullptr;
+  LiveIntervals *LIS = nullptr;
+  VirtRegMap *VRM = nullptr;
+  LiveDebugVariables *DebugVars = nullptr;
   DenseSet<Register> RewriteRegs;
   bool ClearVirtRegs;