Add support for object pool

runtime/vm/assembler_x64.h

 // Copyright (c) 2013, 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_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 294 matching lines @@
 
   static bool sse4_1_supported_;
 #ifdef DEBUG
   static bool initialized_;
 #endif
 };
 
 
 class Assembler : public ValueObject {
  public:
-  Assembler() : buffer_(), prologue_offset_(-1), comments_() { }
+  Assembler()
+      : buffer_(),
+        object_pool_(GrowableObjectArray::Handle()),
+        prologue_offset_(-1),
+        comments_() { }
   ~Assembler() { }
 
   static const bool kNearJump = true;
   static const bool kFarJump = false;
 
   /*
    * Emit Machine Instructions.
    */
   void call(Register reg);
   void call(const Address& address);
@@ skipping 359 matching lines @@
   void Bind(Label* label);
 
   void Comment(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
   const Code::Comments& GetCodeComments() const;
 
   int CodeSize() const { return buffer_.Size(); }
   int prologue_offset() const { return prologue_offset_; }
   const ZoneGrowableArray<int>& GetPointerOffsets() const {
     return buffer_.pointer_offsets();
   }
+  const GrowableObjectArray& object_pool() const { return object_pool_; }
 
   void FinalizeInstructions(const MemoryRegion& region) {
     buffer_.FinalizeInstructions(region);
   }
 
   // Debugging and bringup support.
   void Stop(const char* message);
   void Unimplemented(const char* message);
   void Untested(const char* message);
   void Unreachable(const char* message);
 
   static void InitializeMemoryWithBreakpoints(uword data, int length);
 
   static const char* RegisterName(Register reg);
 
   static const char* FpuRegisterName(FpuRegister reg);
 
  private:
   AssemblerBuffer buffer_;
+  GrowableObjectArray& object_pool_;  // Object pool is not used on x64.
   int prologue_offset_;
 
   class CodeComment : public ZoneAllocated {
    public:
     CodeComment(intptr_t pc_offset, const String& comment)
         : pc_offset_(pc_offset), comment_(comment) { }
 
     intptr_t pc_offset() const { return pc_offset_; }
     const String& comment() const { return comment_; }
 
@@ skipping 116 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_