RFR: JDK-8300783: Consolidate byteswap implementations [v8]

[David Holmes]

On Mon, 6 Mar 2023 16:27:26 GMT, Justin King <jcking at openjdk.org> wrote:

>> CI run was fine wrt these changes.
>
> @dholmes-ora Poke. :)

Sorry @jcking but as I previously indicated I'm not qualified to review the details of this. But I will see if I can get someone else to.

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PR: https://git.openjdk.org/jdk/pull/12114