RFR: 8365557: Parallel: Refactor ParallelScavengeHeap::mem_allocate_work [v2]

[Albert Mingkun Yang]

On Tue, 2 Sep 2025 09:56:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Extract out multi-thread-safe old-gen allocation API call outside the critical-region to streamline the flow in `mem_allocate_work`.
>> 
>> Test: tier1-3
>
> Albert Mingkun Yang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge branch 'master' into pgc-mem-allocate-refactor
>  - pgc-mem-allocate-refactor

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26779#issuecomment-3245180559