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

src/IceTargetLoweringMIPS32.h

 //===- subzero/src/IceTargetLoweringMIPS32.h - MIPS32 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 TargetLoweringMIPS32 class, which implements the
@@ skipping 97 matching lines @@
                            const AssignList &Assignments) override;
   void doAddressOptLoad() override;
   void doAddressOptStore() override;
   void randomlyInsertNop(float Probability) override;
   void makeRandomRegisterPermutation(
       llvm::SmallVectorImpl<int32_t> &Permutation,
       const llvm::SmallBitVector &ExcludeRegisters) const override;
 
   static Type stackSlotType();
 
-  bool UsesFramePointer;
-  bool NeedsStackAlignment;
+  bool UsesFramePointer = false;
+  bool NeedsStackAlignment = false;
   llvm::SmallBitVector TypeToRegisterSet[IceType_NUM];
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
   static IceString RegNames[];
 
 private:
   ~TargetMIPS32() override {}
 };
 
@@ skipping 32 matching lines @@
 protected:
   explicit TargetHeaderMIPS32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderMIPS32() = default;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGMIPS32_H