--- a/src/hotspot/share/oops/symbol.hpp	Fri May 17 10:48:02 2019 -0400
+++ b/src/hotspot/share/oops/symbol.hpp	Fri May 17 08:29:55 2019 -0700
@@ -169,6 +169,7 @@
   bool is_permanent() {
     return (refcount() == PERM_REFCOUNT);
   }
+  void set_permanent();
   void make_permanent();
 
   // Function char_at() returns the Symbol's selected u1 byte as a char type.