RFR: 8336831: Optimize StringConcatHelper.simpleConcat [v7]

[Roger Riggs]

On Tue, 23 Jul 2024 12:56:07 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> Currently simpleConcat is implemented using mix and prepend, but in this simple scenario, it can be implemented in a simpler way and can improve performance.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   reduce change

Marked as reviewed by rriggs (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20253#pullrequestreview-2194894116