VM: Fix more places with isolate embedded into unoptimized code.

runtime/vm/stub_code.h

 // Copyright (c) 2011, 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_STUB_CODE_H_
 #define VM_STUB_CODE_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 
@@ skipping 206 matching lines @@
   static void GenerateNArgsCheckInlineCacheStub(
       Assembler* assembler,
       intptr_t num_args,
       const RuntimeEntry& handle_ic_miss,
       Token::Kind kind,
       RangeCollectionMode range_collection_mode,
       bool optimized = false);
   static void GenerateUsageCounterIncrement(Assembler* assembler,
                                             Register temp_reg);
   static void GenerateOptimizedUsageCounterIncrement(Assembler* assembler);
-
-  static void GenerateIdenticalWithNumberCheckStub(
-      Assembler* assembler,
-      const Register left,
-      const Register right,
-      const Register temp1 = kNoRegister,
-      const Register temp2 = kNoRegister);
 };
 
 }  // namespace dart
 
 #endif  // VM_STUB_CODE_H_