RFR: 8373421: Parallel: Rename young generation eden and survivor space pool

[Thomas Schatzl]

On Wed, 10 Dec 2025 13:11:34 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial renaming two `*SpacePool` classes:
> 
> 
> EdenMutableSpacePool -> PSEdenSpacePool
> SurvivorMutableSpacePool -> PSSurvivorSpacePool
> 
> Test: tier1

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/28744#pullrequestreview-3563372200