RFR: 8373087: Parallel: Rename PSGenerationPool to PSOldGenerationPool [v2]

[Thomas Schatzl]

On Thu, 4 Dec 2025 19:39:36 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Trivial renaming to make it explicit that this class is only for old-gen.
>> 
>> Test: GHA
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28657#pullrequestreview-3544836974