RFR: 8336856: Optimize String Concat [v42]

[Shaojin Wen]

On Mon, 12 Aug 2024 17:44:50 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> This PR implements the same algorithm as the current generateMHInlineCopy based on bytecode to improve startup performance.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix comments

Should we change the title of the PR to `Implementing an efficient string concatenation hidden class strategy based on ClassFile API`?

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PR Comment: https://git.openjdk.org/jdk/pull/20273#issuecomment-2284670355