Add read only handles for the following predefined symbols

vm/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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 192 matching lines @@
   bool IsNew() const { return raw()->IsNewObject(); }
   bool IsOld() const { return raw()->IsOldObject(); }
 
   // Print the object on stdout for debugging.
   void Print() const;
 
   bool IsZoneHandle() const {
     return VMHandles::IsZoneHandle(reinterpret_cast<uword>(this));
   }
 
+  bool IsNotTemporaryScopedHandle() const;
+
   static RawObject* Clone(const Object& src, Heap::Space space = Heap::kNew);
 
   static Object& Handle(Isolate* isolate, RawObject* raw_ptr) {
     Object* obj = reinterpret_cast<Object*>(VMHandles::AllocateHandle(isolate));
     initializeHandle(obj, raw_ptr);
     return *obj;
   }
 
   static Object& Handle() {
     return Handle(Isolate::Current(), null_);
@@ skipping 5918 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_