RFR: 8302163: Speed up various String comparison methods with ArraysSupport.mismatch [v2]

[Claes Redestad]

On Mon, 13 Feb 2023 16:10:14 GMT, Claes Redestad <redestad at openjdk.org> wrote:

>> We can improve various String methods such as `startsWith`, `endsWith` and `regionMatches` by leveraging the intrinsified mismatch methods in `ArraysSupport`.
>
> Claes Redestad has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Clarify coder shift in startsWith

Thanks for reviewing!

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PR: https://git.openjdk.org/jdk/pull/12528