RFR: 8333833: UUID toString removes the use of ByteArrayLittleEndian [v2]

[Glavo]

On Sat, 8 Jun 2024 06:40:39 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> After PR #16245, C2 optimizes stores into primitive arrays by combining values ​​into larger stores. In the UUID.toString method, ByteArrayLittleEndian can be removed, making the code more elegant and faster.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add comments

I think we don't need to change them back everywhere, but only need to rewrite `ByteArrayLittleEndian` and `ByteArray` so that they no longer use `VarHandle`. 

Maybe I should rewrite https://github.com/openjdk/jdk/pull/14636 without using `Unsafe`, so more people might agree with it.

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PR Comment: https://git.openjdk.org/jdk/pull/19610#issuecomment-2156063742