Remove isPooled virtual method from IceOperand.

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 57 matching lines @@
     if (!ALLOW_DUMP)
       return;
     assert(Func);
     dump(Func, Func->getContext()->getStrDump());
   }
   void dump(Ostream &Str) const {
     if (ALLOW_DUMP)
       dump(nullptr, Str);
   }
 
-  // Query whether this object was allocated in isolation, or added to
-  // some higher-level pool.  This determines whether a containing
-  // object's destructor should delete this object.  Generally,
-  // constants are pooled globally, variables are pooled per-CFG, and
-  // target-specific operands are not pooled.
-  virtual bool isPooled() const { return false; }
-
   virtual ~Operand() {}
 
 protected:
   Operand(OperandKind Kind, Type Ty)
       : Ty(Ty), Kind(Kind), NumVars(0), Vars(nullptr) {}
 
   const Type Ty;
   const OperandKind Kind;
   // Vars and NumVars are initialized by the derived class.
   SizeT NumVars;
@@ skipping 533 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