RFR: 8319761: Simplify fields of Array VarHandles

[Magnus Ihse Bursie]

On Sun, 24 Sep 2023 13:17:05 GMT, Chen Liang <liach at openjdk.org> wrote:

> 1. Primitive array VHs are now singletons and no longer need to record their array base and offset in their object themselves.
> 2. Moved Unsafe offset calculation to a utility method, like `index` in VarHandleByteArrayView.

Build changes look good.

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Marked as reviewed by ihse (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15894#pullrequestreview-1723191512