src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/memory/MemoryPhiNode.java

*** 60,65 ****
--- 60,70 ----
  
      @Override
      public NodeInputList<ValueNode> values() {
          return values;
      }
+ 
+     @Override
+     protected String valueDescription() {
+         return locationIdentity.toString();
+     }
  }