--- /dev/null	2016-05-31 09:42:47.975716356 -0700
+++ new/src/jdk.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/IdentityHashCodeNode.java	2016-12-09 00:49:53.154363898 -0800
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.graalvm.compiler.hotspot.replacements;
+
+import static org.graalvm.compiler.core.common.GraalOptions.ImmutableCode;
+import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
+import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
+
+import org.graalvm.compiler.core.common.LocationIdentity;
+import org.graalvm.compiler.core.common.type.AbstractObjectStamp;
+import org.graalvm.compiler.core.common.type.StampFactory;
+import org.graalvm.compiler.graph.Node;
+import org.graalvm.compiler.graph.NodeClass;
+import org.graalvm.compiler.graph.spi.Canonicalizable;
+import org.graalvm.compiler.graph.spi.CanonicalizerTool;
+import org.graalvm.compiler.nodeinfo.NodeInfo;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.FixedWithNextNode;
+import org.graalvm.compiler.nodes.ValueNode;
+import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
+import org.graalvm.compiler.nodes.spi.Lowerable;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+
+import jdk.vm.ci.hotspot.HotSpotObjectConstant;
+import jdk.vm.ci.meta.JavaConstant;
+
+@NodeInfo(cycles = CYCLES_0, size = SIZE_0)
+public class IdentityHashCodeNode extends FixedWithNextNode implements Canonicalizable, Lowerable, MemoryCheckpoint.Single {
+
+    public static final NodeClass<IdentityHashCodeNode> TYPE = NodeClass.create(IdentityHashCodeNode.class);
+
+    @Input ValueNode object;
+
+    public IdentityHashCodeNode(ValueNode object) {
+        super(TYPE, StampFactory.forInteger(32));
+        this.object = object;
+
+    }
+
+    @Override
+    public LocationIdentity getLocationIdentity() {
+        return HotSpotReplacementsUtil.MARK_WORD_LOCATION;
+    }
+
+    @Override
+    public Node canonical(CanonicalizerTool tool) {
+        if (object.isConstant()) {
+            assert object.stamp() instanceof AbstractObjectStamp;
+            JavaConstant c = (JavaConstant) object.asConstant();
+            if (ImmutableCode.getValue()) {
+                return this;
+            }
+            JavaConstant identityHashCode = null;
+            if (c.isNull()) {
+                identityHashCode = JavaConstant.forInt(0);
+            } else {
+                identityHashCode = JavaConstant.forInt(((HotSpotObjectConstant) c).getIdentityHashCode());
+            }
+
+            return new ConstantNode(identityHashCode, StampFactory.forConstant(identityHashCode));
+        }
+        return this;
+    }
+
+    @Override
+    public void lower(LoweringTool tool) {
+        tool.getLowerer().lower(this, tool);
+    }
+
+    @NodeIntrinsic
+    public static native int identityHashCode(Object object);
+
+}