--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotLIRKindTool.java	2017-12-13 08:52:31.000000000 -0800
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot.amd64/src/org/graalvm/compiler/hotspot/amd64/AMD64HotSpotLIRKindTool.java	2017-12-13 08:52:30.000000000 -0800
@@ -22,14 +22,15 @@
  */
 package org.graalvm.compiler.hotspot.amd64;
 
-import jdk.vm.ci.amd64.AMD64Kind;
 import org.graalvm.compiler.core.amd64.AMD64LIRKindTool;
 import org.graalvm.compiler.core.common.LIRKind;
 
+import jdk.vm.ci.amd64.AMD64Kind;
+
 public class AMD64HotSpotLIRKindTool extends AMD64LIRKindTool {
     @Override
     public LIRKind getNarrowOopKind() {
-        return LIRKind.reference(AMD64Kind.DWORD);
+        return LIRKind.compressedReference(AMD64Kind.DWORD);
     }
 
     @Override