--- a/src/hotspot/share/gc/shared/collectedHeap.hpp	Mon Apr 23 12:53:43 2018 +0200
+++ b/src/hotspot/share/gc/shared/collectedHeap.hpp	Thu Apr 26 17:59:02 2018 +0200
@@ -592,6 +592,8 @@
   virtual oop pin_object(JavaThread* thread, oop obj);
   virtual void unpin_object(JavaThread* thread, oop obj);
 
+  virtual bool is_oop(oop object) const;
+
   // Non product verification and debugging.
 #ifndef PRODUCT
   // Support for PromotionFailureALot.  Return true if it's time to cause a