Remove unused function GeneratePreEntryCode from ia32 code generator.

vm/code_generator_ia32.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_CODE_GENERATOR_IA32_H_
 #define VM_CODE_GENERATOR_IA32_H_
 
 #ifndef VM_CODE_GENERATOR_H_
 #error Do not include code_generator_ia32.h directly; use code_generator.h.
 #endif
@@ skipping 116 matching lines @@
   friend class OptimizingCodeGenerator;
 
   // Return true if intrinsification succeeded and no more code is needed.
   // Returns false if either no intrinsification occured or if intrinsified
   // code needs the rest for slow case execution.
   bool TryIntrinsify();
 
   void IntrinsifyGetter();
   void IntrinsifySetter();
 
-  virtual void GeneratePreEntryCode();
   void GenerateLegacyEntryCode();
   void GenerateEntryCode();
   void GenerateLoadVariable(Register dst, const LocalVariable& local);
   void GeneratePushVariable(const LocalVariable& variable, Register scratch);
   void GenerateStoreVariable(const LocalVariable& local,
                              Register src,
                              Register scratch);
   void GenerateLogicalNotOp(UnaryOpNode* node);
   void GenerateLogicalAndOrOp(BinaryOpNode* node);
   void GenerateInstanceGetterCall(intptr_t node_id,
@@ skipping 114 matching lines @@
   // The runtime context level is only incremented when a new context is
   // allocated and chained to the list of contexts.
   intptr_t context_level_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CodeGenerator);
 };
 
 }  // namespace dart
 
 #endif  // VM_CODE_GENERATOR_IA32_H_