RFR: 8347554: [BACKOUT] C2: implement optimization for series of Add of unique value

[Tobias Hartmann]

On Mon, 13 Jan 2025 11:53:43 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> The Java Fuzzer found a wrong execution which could be traced back to [JDK-8325495](https://bugs.openjdk.org/browse/JDK-8325495) which went into JDK 24. Since we are close to RDP 2, a backout seems the safest option for JDK 24. A REDO can be done for JDK 25 @tabjy.
> 
> Details about the wrong execution and how to trigger it can be found in the JBS description of this backout.
> 
> The backout applied cleanly.
> 
> Thanks,
> Christian

Looks good and trivial.

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Marked as reviewed by thartmann (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23066#pullrequestreview-2546420033