[lworld] Intrinsify new instance-accepting array unsafe operations

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      Since arrays are now polymorphic, it would be helpful if core libraries can access properties of arrays to classify them quickly. Here are some desired APIs in Unsafe:

      1. arrayLayout0 - the actual type of array (combined with class)
      2. arrayInstanceBaseOffset0 - the offset from the flat/refArrayKlass
      3. arrayInstanceIndexScale0 - the scale from the flat/refArrayKlass

      These were introduced by JDK-8368933 (and renamed by JDK-8368933).

            Assignee:
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            Reporter:
            Chen Liang
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              Created:
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