Subzero: Use C++11 member initializers where practical.

src/IceTargetLoweringARM32.h

Index: src/IceTargetLoweringARM32.h
diff --git a/src/IceTargetLoweringARM32.h b/src/IceTargetLoweringARM32.h
index 5eb320f25a4910140ec0a0fbe1886125fd3586a6..b7efac3d1c04a5b5253577c89b1c3a8ce2756fbe 100644
--- a/src/IceTargetLoweringARM32.h
+++ b/src/IceTargetLoweringARM32.h
@@ -302,11 +302,11 @@ protected:
     Context.insert(InstARM32Uxt::create(Func, Dest, Src0, Pred));
   }
 
-  ARM32InstructionSet InstructionSet;
-  bool UsesFramePointer;
-  bool NeedsStackAlignment;
-  bool MaybeLeafFunc;
-  size_t SpillAreaSizeBytes;
+  ARM32InstructionSet InstructionSet = ARM32InstructionSet::Begin;
+  bool UsesFramePointer = false;
+  bool NeedsStackAlignment = false;
+  bool MaybeLeafFunc = true;
+  size_t SpillAreaSizeBytes = 0;
   llvm::SmallBitVector TypeToRegisterSet[IceType_NUM];
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;