RFR: 8347555: [REDO] C2: implement optimization for series of Add of unique value [v7]

[Emanuel Peter]

On Fri, 10 Oct 2025 14:01:31 GMT, Kangcheng Xu <kxu at openjdk.org> wrote:

>> @tabjy The code now looks good to me. I ran some internal testing, should take about 24h.
>
> Many thanks to @eme64 and @rwestrel for reviewing. It was really educational!

@tabjy Congrats on the integration!

This is not an official rule, but we consider it good practice not to integrate of Friday, and even less on Friday afternoon. If something breaks you probably would not be around on the weekend to fix it, and so it would mean we have more failing tests in the CI, and waste resources and have a polluted CI pipeline. It could then happen that someone just backs out your change, instead of giving you a few hours to fix a P1 bug. Again, not an official rule, just something we like to do ;)

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PR Comment: https://git.openjdk.org/jdk/pull/23506#issuecomment-3391908282