Sparc - fix uninitialized variable warnings. NFCI.

llvm/lib/Target/Sparc/DelaySlotFiller.cpp

@@ -37,7 +37,7 @@ static cl::opt<bool> DisableDelaySlotFiller(
 
 namespace {
   struct Filler : public MachineFunctionPass {
-    const SparcSubtarget *Subtarget;
+    const SparcSubtarget *Subtarget = nullptr;
 
     static char ID;
     Filler() : MachineFunctionPass(ID) {}

llvm/lib/Target/Sparc/LeonPasses.h

@@ -23,7 +23,7 @@ namespace llvm {
 class LLVM_LIBRARY_VISIBILITY LEONMachineFunctionPass
     : public MachineFunctionPass {
 protected:
-  const SparcSubtarget *Subtarget;
+  const SparcSubtarget *Subtarget = nullptr;
   const int LAST_OPERAND = -1;
 
   // this vector holds free registers that we allocate in groups for some of the

llvm/lib/Target/Sparc/SparcISelDAGToDAG.cpp

@@ -31,7 +31,7 @@ namespace {
 class SparcDAGToDAGISel : public SelectionDAGISel {
   /// Subtarget - Keep a pointer to the Sparc Subtarget around so that we can
   /// make the right decision when generating code for different targets.
-  const SparcSubtarget *Subtarget;
+  const SparcSubtarget *Subtarget = nullptr;
 public:
   explicit SparcDAGToDAGISel(SparcTargetMachine &tm) : SelectionDAGISel(tm) {}