--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/AccessMonitorNode.java	2017-03-20 17:40:52.000000000 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/java/AccessMonitorNode.java	2017-03-20 17:40:52.000000000 -0700
@@ -68,6 +68,11 @@
         return object;
     }
 
+    public void setObject(ValueNode lockedObject) {
+        updateUsages(this.object, lockedObject);
+        this.object = lockedObject;
+    }
+
     public MonitorIdNode getMonitorId() {
         return monitorId;
     }