Subzero: Fix some -Winconsistent-missing-override that clang 3.6 warns about.

src/IceOperand.h

 //===- subzero/src/IceOperand.h - High-level operands -----------*- 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 Operand class and its target-independent
@@ skipping 86 matching lines @@
 // Constant is the abstract base class for constants.  All
 // constants are allocated from a global arena and are pooled.
 class Constant : public Operand {
   Constant(const Constant &) = delete;
   Constant &operator=(const Constant &) = delete;
 
 public:
   void emitPoolLabel(Ostream &Str) const {
     Str << ".L$" << getType() << "$" << PoolEntryID;
   }
-  using Operand::dump;
   void emit(const Cfg *Func) const override { emit(Func->getContext()); }
   virtual void emit(GlobalContext *Ctx) const = 0;
-  void dump(const Cfg *Func, Ostream &Str) const = 0;
 
   static bool classof(const Operand *Operand) {
     OperandKind Kind = Operand->getKind();
     return Kind >= kConst_Base && Kind <= kConst_Num;
   }
 
 protected:
   Constant(OperandKind Kind, Type Ty, uint32_t PoolEntryID)
       : Operand(Kind, Ty), PoolEntryID(PoolEntryID) {
     Vars = nullptr;
@@ skipping 502 matching lines @@
 private:
   const Cfg *Func;
   MetadataKind Kind;
   std::vector<VariableTracking> Metadata;
   const static InstDefList NoDefinitions;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEOPERAND_H