RFR: 8310311: Serial: move Generation::contribute_scratch to DefNewGeneration [v3]

[Kim Barrett]

On Mon, 31 Jul 2023 09:51:22 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple cleanup to move a method from base-class to  sub-class.
>> 
>> Test: hotspot_gc
>
> 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:
> 
>  - static
>  - s1-contribute-scratch

Looks good, other than the constexpr vs const discussion.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14540#pullrequestreview-1554756325