8179918: EnumSet spliterator should report SORTED, ORDERED, NONNULL

[kilink]

I noticed that the Spliterator for EnumSet does not report SORTED, ORDERED, or NONNULL characteristics, all of which are inherent to API of EnumSet. I found there's an existing ticket for this as well.

The ticket also mentions optimized forEach, etc, which I presume means avoiding the default implementation that uses the iterator and just iterating over the bitset directly; I can add that here or perhaps in a follow up if it's still deemed worthwhile.

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• JDK-8179918: EnumSet spliterator should report SORTED, ORDERED, NONNULL (Bug - P3)

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