Added following dart API changes to enable more efficient access based

runtime/vm/isolate.cc

 // 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
 #include "vm/code_observers.h"
 #include "vm/compiler_stats.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/heap.h"
 #include "vm/heap_histogram.h"
 #include "vm/message_handler.h"
 #include "vm/object_id_ring.h"
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/port.h"
+#include "vm/reusable_handles.h"
 #include "vm/service.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 #include "vm/thread.h"
 #include "vm/timer.h"
 #include "vm/visitor.h"
 
 
@@ skipping 1065 matching lines @@
 void Isolate::MaterializeDeferredBoxes() {
   FillDeferredSlots(&deferred_boxes_);
 }
 
 
 void Isolate::MaterializeDeferredObjects() {
   FillDeferredSlots(&deferred_object_refs_);
 }
 
 
-void ReusableHandleScope::ResetHandles() {
-#define CLEAR_REUSABLE_HANDLE(object)                                          \
-  if (!object##Handle().IsNull()) {                                            \
-    object##Handle().raw_ = Object::null();                                    \
-  }
-
-  REUSABLE_HANDLE_LIST(CLEAR_REUSABLE_HANDLE);
-}
-
-
 static char* GetRootScriptUri(Isolate* isolate) {
   const Library& library =
       Library::Handle(isolate->object_store()->root_library());
   ASSERT(!library.IsNull());
   const String& script_name = String::Handle(library.url());
   return isolate->current_zone()->MakeCopyOfString(script_name.ToCString());
 }
 
 
 IsolateSpawnState::IsolateSpawnState(const Function& func,
@@ skipping 70 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart