--- old/src/share/vm/opto/memnode.hpp	2021-04-28 19:35:15.586408720 +0800
+++ new/src/share/vm/opto/memnode.hpp	2021-04-28 19:35:15.468404079 +0800
@@ -89,10 +89,6 @@
   // This one should probably be a phase-specific function:
   static bool all_controls_dominate(Node* dom, Node* sub);
 
-  // Find any cast-away of null-ness and keep its control.
-  static  Node *Ideal_common_DU_postCCP( PhaseCCP *ccp, Node* n, Node* adr );
-  virtual Node *Ideal_DU_postCCP( PhaseCCP *ccp );
-
   virtual const class TypePtr *adr_type() const;  // returns bottom_type of address
 
   // Shared code for Ideal methods: