[lworld] Improve performance of arraycopy intrinsics

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      Especially now that we added support for nullable, atomic, flat arrays with JDK-8341767, we need to re-work the implementation of the arraycopy intrinsics.

      This includes performance work for the following intrinsics:
      - _arraycopy
      - _copyOf
      - _copyOfRange

      For copyOf(Range), look at "TODO 8251971" comments in the code and tests.

      Some of this is also tracked by JDK-8350865.

            Assignee:
            Unassigned
            Reporter:
            Tobias Hartmann
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              Created:
              Updated: