RFR: 8364628: Serial: Refactor SerialHeap::mem_allocate_work [v2]

[Albert Mingkun Yang]

On Wed, 13 Aug 2025 10:48:14 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Extract out old-gen allocation outside the critical-region to streamline the flow in `mem_allocate_work`.
>> 
>> Test: tier1-5
>
> 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 sgc-mem-allocate
>  - sgc-mem-allocate

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26619#issuecomment-3188733625