Uses an object pool on x64

runtime/vm/instructions_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.
 // Classes that describe assembly patterns as used by inline caches.
 
 #ifndef VM_INSTRUCTIONS_IA32_H_
 #define VM_INSTRUCTIONS_IA32_H_
 
 #ifndef VM_INSTRUCTIONS_H_
 #error Do not include instructions_ia32.h directly; use instructions.h instead.
 #endif
 
 #include "vm/allocation.h"
+#include "vm/object.h"
 
 namespace dart {
 
 // Forward declarations.
 class RawClass;
 class Immediate;
 class RawObject;
 
 // Abstract class for all instruction pattern classes.
 class InstructionPattern : public ValueObject {
@@ skipping 54 matching lines @@
 
  private:
   virtual const int* pattern() const;
 
   DISALLOW_COPY_AND_ASSIGN(CallPattern);
 };
 
 
 class JumpPattern : public CallOrJumpPattern {
  public:
-  explicit JumpPattern(uword pc) : CallOrJumpPattern(pc) {}
+  JumpPattern(uword pc, const Code& code) : CallOrJumpPattern(pc) {}
 
  private:
   virtual const int* pattern() const;
 
   DISALLOW_COPY_AND_ASSIGN(JumpPattern);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_IA32_H_