[api] Bring back finalizers on global handles

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index ac8487b19fb6ee7b2127b9333e279f70e34e38f3..4339c2dda3a07cd65d256ecff817778ee0956ef0 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -96,7 +96,6 @@ struct ObjectGroupRetainerInfo {
   RetainedObjectInfo* info;
 };
 
-
 enum WeaknessType {
   NORMAL_WEAK,  // Embedder gets a handle to the dying object.
   // In the following cases, the embedder gets the parameter they passed in
@@ -105,10 +104,11 @@ enum WeaknessType {
   // objects through this interface would be GC unsafe so in that case the
   // embedder gets a null pointer instead.
   PHANTOM_WEAK,
-  PHANTOM_WEAK_2_INTERNAL_FIELDS
+  PHANTOM_WEAK_2_INTERNAL_FIELDS,
+  // Like NORMAL_WEAK, but uses WeakCallbackInfo instead of WeakCallbackData.
+  FINALIZER_WEAK,
 };
 
-
 class GlobalHandles {
  public:
   ~GlobalHandles();