Spliterator implementations

[Doug Lea]

In the midst of trying various approaches for
ConcurrentSkipList* spliterators (six or more methods
supplying them!) I pasted the "All Known Implementing Classes"
list from JDK7 Collection and Map javadocs and threw this list
together of classes that may need spliterator implementations.
(or may not, depending on defaults).
As far as I know, exactly two (ArrayList and CHM) are
complete and in use at the moment.
In case you are interested, here it is:


For top-level classes only:
   j.u.c/jsr166:
     ArrayDeque,
     ArrayBlockingQueue,
     ConcurrentLinkedDeque,
     ConcurrentLinkedQueue,
     CopyOnWriteArraySet,
     DelayQueue,
     LinkedBlockingDeque,
     LinkedBlockingQueue,
     LinkedTransferQueue,
     PriorityBlockingQueue,
     PriorityQueue,
     SynchronousQueue
   j.u:
     AbstractCollection,
     AbstractQueue,
     AbstractSet,
     EnumSet,
     HashSet (delegates to HashMap.keySet),
     LinkedHashSet (delegates to LinkedHashMap.keySet)
     Stack,
   other jdk:
     BeanContextSupport (delegates to HashMap.keySet)
     BeanContextServicesSupport (super BeanContextSupport)
     JobStateReasons, (super HashSet)

For both top-level and subList classes
   j.u.c/jsr166
     CopyOnWriteArrayList,
   j.u:
     AbstractList,
     AbstractSequentialList,
     ArrayList,
     AttributeList,
     LinkedList,
     Stack (super Vector),
     Vector
   other jdk:
     RoleList (super ArrayList),
     RoleUnresolvedList (super ArrayList),
For both top-level and subSet classes:
   j.u.c/jsr166
     ConcurrentSkipListSet,
     TreeSet
For keySet, values and entrySet views of:
   j.u.c/jsr166
     ConcurrentHashMap,
   j.u:
     AbstractMap,
     EnumMap,
     HashMap,
     Hashtable,
     IdentityHashMap,
     LinkedHashMap, (super HashMap but cannot use same Spliterator)
     WeakHashMap
   other jdk:
     Attributes (delegates to HashMap)
     AuthProvider (super Provider)
     PrinterStateReasons, (super HashMap)
     Properties, (super Hashtable)
     Provider (super Properties),
     RenderingHints (delegates to HashMap)
     SimpleBindings (delegates to any Map),
     TabularDataSupport, (delegates to
     UIDefaults, (super Hashtable)
For keySet, values and entrySet views, plus the same for subMap views:
   j.u.c/jsr166
     ConcurrentSkipListMap,
     TreeMap,