--- old/src/hotspot/share/runtime/vmOperations.hpp	2019-07-11 14:50:10.953265230 -0400
+++ new/src/hotspot/share/runtime/vmOperations.hpp	2019-07-11 14:50:10.457246898 -0400
@@ -501,6 +501,7 @@
     }
   }
   VMOp_Type type() const { return VMOp_Exit; }
+  bool doit_prologue();
   void doit();
 };