--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/UnaryNode.java	2017-11-03 23:57:12.512613536 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/UnaryNode.java	2017-11-03 23:57:12.185598902 -0700
@@ -45,6 +45,11 @@
         return value;
     }
 
+    public void setValue(ValueNode value) {
+        updateUsages(this.value, value);
+        this.value = value;
+    }
+
     /**
      * Creates a new UnaryNode instance.
      *