--- old/src/share/vm/opto/phaseX.hpp	2021-01-25 19:30:49.037975143 +0000
+++ new/src/share/vm/opto/phaseX.hpp	2021-01-25 19:30:48.913973839 +0000
@@ -327,6 +327,8 @@
                                const Type* limit_type) const
   { ShouldNotCallThis(); return NULL; }
 
+  virtual PhaseIterGVN *is_IterGVN() { return 0; }
+
 #ifndef PRODUCT
   void dump_old2new_map() const;
   void dump_new( uint new_lidx ) const;