--- old/src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.hpp	2019-11-22 13:54:04.475982767 +0100
+++ new/src/hotspot/cpu/x86/gc/shared/barrierSetAssembler_x86.hpp	2019-11-22 13:54:04.227978575 +0100
@@ -49,6 +49,9 @@
   virtual void store_at(MacroAssembler* masm, DecoratorSet decorators, BasicType type,
                         Address dst, Register val, Register tmp1, Register tmp2, Register tmp3 = noreg);
 
+  virtual void value_copy(MacroAssembler* masm, DecoratorSet decorators,
+                          Register src, Register dst, Register value_klass);
+
 #ifndef _LP64
   virtual void obj_equals(MacroAssembler* masm,
                           Address obj1, jobject obj2);