--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.amd64/src/org/graalvm/compiler/core/amd64/AMD64LIRKindTool.java	2017-11-03 23:55:46.532766024 -0700
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.amd64/src/org/graalvm/compiler/core/amd64/AMD64LIRKindTool.java	2017-11-03 23:55:45.892737383 -0700
@@ -28,7 +28,7 @@
 
 import jdk.vm.ci.amd64.AMD64Kind;
 
-public class AMD64LIRKindTool implements LIRKindTool {
+public abstract class AMD64LIRKindTool implements LIRKindTool {
 
     @Override
     public LIRKind getIntegerKind(int bits) {
@@ -67,12 +67,8 @@
     }
 
     @Override
-    public LIRKind getNarrowOopKind() {
-        return LIRKind.reference(AMD64Kind.DWORD);
-    }
+    public abstract LIRKind getNarrowOopKind();
 
     @Override
-    public LIRKind getNarrowPointerKind() {
-        return LIRKind.value(AMD64Kind.DWORD);
-    }
+    public abstract LIRKind getNarrowPointerKind();
 }