Removes const qualification for two methods in TargetDataLowering.

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 @@
   llvm::SmallBitVector TypeToRegisterSet[IceType_NUM];
   llvm::SmallBitVector ScratchRegs;
   llvm::SmallBitVector RegsUsed;
   VarList PhysicalRegisters[IceType_NUM];
   static IceString RegNames[];
 
 private:
   ~TargetARM32() override {}
 };
 
-class TargetDataARM32 : public TargetDataLowering {
+class TargetDataARM32 final : public TargetDataLowering {
   TargetDataARM32() = delete;
   TargetDataARM32(const TargetDataARM32 &) = delete;
   TargetDataARM32 &operator=(const TargetDataARM32 &) = delete;
 
 public:
   static std::unique_ptr<TargetDataLowering> create(GlobalContext *Ctx) {
     return std::unique_ptr<TargetDataLowering>(new TargetDataARM32(Ctx));
   }
 
-  void lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) const final;
-  void lowerConstants() const final;
+  void lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) override;
+  void lowerConstants() override;
 
 protected:
   explicit TargetDataARM32(GlobalContext *Ctx);
 
 private:
   void lowerGlobal(const VariableDeclaration &Var) const;
   ~TargetDataARM32() override {}
   template <typename T> static void emitConstantPool(GlobalContext *Ctx);
 };
 
 class TargetHeaderARM32 final : public TargetHeaderLowering {
   TargetHeaderARM32() = delete;
   TargetHeaderARM32(const TargetHeaderARM32 &) = delete;
   TargetHeaderARM32 &operator=(const TargetHeaderARM32 &) = delete;
 
 public:
   static std::unique_ptr<TargetHeaderLowering> create(GlobalContext *Ctx) {
     return std::unique_ptr<TargetHeaderLowering>(new TargetHeaderARM32(Ctx));
   }
 
-  void lower();
+  void lower() override;
 
 protected:
   explicit TargetHeaderARM32(GlobalContext *Ctx);
 
 private:
   ~TargetHeaderARM32() = default;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGARM32_H