PowerPC - fix uninitialized variable warnings. NFCI.

Author: RKSimon

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp

@@ -79,7 +79,7 @@ namespace {
 class PPCAsmPrinter : public AsmPrinter {
 protected:
   MapVector<const MCSymbol *, MCSymbol *> TOC;
-  const PPCSubtarget *Subtarget;
+  const PPCSubtarget *Subtarget = nullptr;
   StackMaps SM;
 
 public:

llvm/lib/Target/PowerPC/PPCISelDAGToDAG.cpp

@@ -138,9 +138,9 @@ namespace {
   ///
   class PPCDAGToDAGISel : public SelectionDAGISel {
     const PPCTargetMachine &TM;
-    const PPCSubtarget *PPCSubTarget;
-    const PPCTargetLowering *PPCLowering;
-    unsigned GlobalBaseReg;
+    const PPCSubtarget *PPCSubTarget = nullptr;
+    const PPCTargetLowering *PPCLowering = nullptr;
+    unsigned GlobalBaseReg = 0;
 
   public:
     explicit PPCDAGToDAGISel(PPCTargetMachine &tm, CodeGenOpt::Level OptLevel)
@@ -2385,15 +2385,15 @@ class BitPermutationSelector {
 
   SmallVector<ValueBit, 64> Bits;
 
-  bool NeedMask;
+  bool NeedMask = false;
   SmallVector<unsigned, 64> RLAmt;
 
   SmallVector<BitGroup, 16> BitGroups;
 
   DenseMap<std::pair<SDValue, unsigned>, ValueRotInfo> ValueRots;
   SmallVector<ValueRotInfo, 16> ValueRotsVec;
 
-  SelectionDAG *CurDAG;
+  SelectionDAG *CurDAG = nullptr;
 
 public:
   BitPermutationSelector(SelectionDAG *DAG)

llvm/lib/Target/PowerPC/PPCMachineFunctionInfo.h

@@ -42,7 +42,7 @@ class PPCFunctionInfo : public MachineFunctionInfo {
   /// MustSaveLR - Indicates whether LR is defined (or clobbered) in the current
   /// function.  This is only valid after the initial scan of the function by
   /// PEI.
-  bool MustSaveLR;
+  bool MustSaveLR = false;
 
   /// MustSaveTOC - Indicates that the TOC save needs to be performed in the
   /// prologue of the function. This is typically the case when there are