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

src/IceTargetLoweringARM32.h

 //===- subzero/src/IceTargetLoweringARM32.h - ARM32 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLoweringARM32 class, which implements the
@@ skipping 284 matching lines @@
         InstARM32Umull::create(Func, DestLo, DestHi, Src0, Src1, Pred));
     // Model the modification to the second dest as a fake def.
     // Note that the def is not predicated.
     Context.insert(InstFakeDef::create(Func, DestHi, DestLo));
   }
   void _uxt(Variable *Dest, Variable *Src0,
             CondARM32::Cond Pred = CondARM32::AL) {
     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;
   VarList PhysicalRegisters[IceType_NUM];
   static IceString RegNames[];
 
   // Helper class that understands the Calling Convention and register
   // assignments. The first few integer type parameters can use r0-r3,
   // regardless of their position relative to the floating-point/vector
   // arguments in the argument list. Floating-point and vector arguments
@@ skipping 61 matching lines @@
 protected:
   explicit TargetHeaderARM32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderARM32() = default;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H