Phantom references support internal fields

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index aacdcbc072d0ae26af7ce6264767d8366ee17f7a..46f2c7025e5764a25e1c7f1c8b7c36c06567fa3b 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -111,6 +111,7 @@ class GlobalHandles {
   static void Destroy(Object** location);
 
   typedef WeakCallbackData<v8::Value, void>::Callback WeakCallback;
+  typedef PhantomCallbackData<void>::Callback PhantomCallback;
 
   // For a phantom weak reference, the callback does not have access to the
   // dying object.  Phantom weak references are preferred because they allow
@@ -127,9 +128,14 @@ class GlobalHandles {
   // GC.  For a phantom weak handle the handle is cleared (set to a Smi)
   // before the callback is invoked, but the handle can still be identified
   // in the callback by using the location() of the handle.
-  static void MakeWeak(Object** location, void* parameter,
-                       WeakCallback weak_callback,
-                       PhantomState phantom = Nonphantom);
+  static void MakeWeak(
+      Object** location, void* parameter, WeakCallback weak_callback);
+
+  static void MakePhantom(
+      Object** location, void* parameter,
+      PhantomCallback weak_callback,
+      int internal_field_index1 = v8::Object::kNoInternalFieldIndex,
+      int internal_field_index2 = v8::Object::kNoInternalFieldIndex);
 
   void RecordStats(HeapStats* stats);