Add support for object pool

runtime/vm/raw_object.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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 773 matching lines @@
   // Variable length data follows here.
   int32_t data_[0];
 
   friend class StackFrame;
 };
 
 
 class RawInstructions : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(Instructions);
 
+  RawObject** from() {
+    return reinterpret_cast<RawObject**>(&ptr()->code_);
+  }
   RawCode* code_;
+  RawArray* object_pool_;
+  RawObject** to() {
+    return reinterpret_cast<RawObject**>(&ptr()->object_pool_);
+  }
   intptr_t size_;
 
   // Variable length data follows here.
   uint8_t data_[0];
 
   // Private helper function used while visiting stack frames. The
   // code which iterates over dart frames is also called during GC and
   // is not allowed to create handles.
   static bool ContainsPC(RawObject* raw_obj, uword pc);
 
@@ skipping 887 matching lines @@
          kExternalUint64ArrayCid == kExternalInt8ArrayCid + 8 &&
          kExternalFloat32ArrayCid == kExternalInt8ArrayCid + 9 &&
          kExternalFloat64ArrayCid == kExternalInt8ArrayCid + 10 &&
          kStacktraceCid == kExternalInt8ArrayCid + 11);
   return (index >= kExternalInt8ArrayCid && index <= kExternalFloat64ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_