RFR: 8339635: StringConcatFactory optimization for CompactStrings off [v2]

[Chen Liang]

On Fri, 6 Sep 2024 00:21:07 GMT, Shaojin Wen <swen at openjdk.org> wrote:

>> A small optimization, when CompactStrings is turned off, the coder method is not generated, which improves the startup performance
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add java doc

Marked as reviewed by liach (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20722#pullrequestreview-2284384596