cow: add committed javap evidence for the internal lock field, renumber the preserved race-condition output to make room for it

cow/output/06-javap-lock-field.txt

@@ -0,0 +1,3 @@
+$ javap -p java.util.concurrent.CopyOnWriteArrayList | grep -i lock
+  final transient java.lang.Object lock;
+  private void resetLock();