diff -r a4ddd1667c72 -r 304c63b17b07 src/hotspot/share/gc/z/zBarrier.hpp
--- a/src/hotspot/share/gc/z/zBarrier.hpp	Tue Nov 05 10:11:18 2019 +0000
+++ b/src/hotspot/share/gc/z/zBarrier.hpp	Thu Oct 31 17:16:36 2019 +0100
@@ -119,6 +119,7 @@
   static oop  load_barrier_on_oop_field(volatile narrowOop* p);
   static oop  load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o);
   static void load_barrier_on_oop_array(volatile narrowOop* p, size_t length);
+  static void clone_oop(volatile oop src, oop dst, size_t length);
   static oop  load_barrier_on_weak_oop_field_preloaded(volatile narrowOop* p, oop o);
   static oop  load_barrier_on_phantom_oop_field_preloaded(volatile narrowOop* p, oop o);
   static oop  weak_load_barrier_on_oop_field_preloaded(volatile narrowOop* p, oop o);