RFR: 8366063: Parallel: Refactor copy_unmarked_to_survivor_space [v2]

[Albert Mingkun Yang]

On Tue, 2 Sep 2025 09:55:59 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Extract out young/old generation allocation logic so that the evacuation method flow becomes clear and easier to follow.
>> 
>> Test: tier1-5; perf neutral for specjvm2008, dacapo and some synthetic bms.
>
> 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-young-gc-alloc-refactor
>  - pgc-young-gc-alloc-refactor

Thanks for review.

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PR Comment: https://git.openjdk.org/jdk/pull/26922#issuecomment-3245266950