--- a/src/hotspot/share/gc/shared/collectedHeap.hpp	Mon Apr 23 13:32:00 2018 +0200
+++ b/src/hotspot/share/gc/shared/collectedHeap.hpp	Mon Apr 23 11:25:53 2018 +0200
@@ -591,6 +591,8 @@
   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