--- old/src/hotspot/share/runtime/vmOperations.hpp	2019-05-25 10:48:00.578888188 -0400
+++ new/src/hotspot/share/runtime/vmOperations.hpp	2019-05-25 10:47:59.822888148 -0400
@@ -498,6 +498,7 @@
     }
   }
   VMOp_Type type() const { return VMOp_Exit; }
+  bool doit_prologue();
   void doit();
 };