RFR: 8372269: Parallel: Remove unused ParallelScavengeHeap::base

[Albert Mingkun Yang]

On Thu, 20 Nov 2025 12:56:39 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.
> 
> Test: tier1

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/28427#issuecomment-3563113080