--- old/src/share/vm/opto/node.cpp	2021-04-28 19:35:15.976424056 +0800
+++ new/src/share/vm/opto/node.cpp	2021-04-28 19:35:15.854419259 +0800
@@ -1432,12 +1432,6 @@
   return false;
 }
 
-//------------------------------Ideal_DU_postCCP-------------------------------
-// Idealize graph, using DU info.  Must clone result into new-space
-Node *Node::Ideal_DU_postCCP( PhaseCCP * ) {
-  return NULL;                 // Default to no change
-}
-
 //------------------------------hash-------------------------------------------
 // Hash function over Nodes.
 uint Node::hash() const {
@@ -2126,6 +2120,14 @@
   return found;
 }
 
+void Node::ensure_control_or_add_prec(Node* c) {
+  if (in(0) == NULL) {
+    set_req(0, c);
+  } else if (in(0) != c) {
+    add_prec(c);
+  }
+}
+
 //=============================================================================
 //------------------------------yank-------------------------------------------
 // Find and remove