src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/type/NarrowOopStamp.java

@@ -43,10 +43,17 @@
         super(type, exactType, nonNull, alwaysNull);
         this.encoding = encoding;
     }
 
     @Override
+    public void accept(Visitor v) {
+        super.accept(v);
+        v.visitLong(encoding.getBase());
+        v.visitInt(encoding.getShift());
+    }
+
+    @Override
     protected abstract AbstractObjectStamp copyWith(ResolvedJavaType type, boolean exactType, boolean nonNull, boolean alwaysNull);
 
     public Stamp uncompressed() {
         return new ObjectStamp(type(), isExactType(), nonNull(), alwaysNull());
     }