RFR: 8332448: Make SpaceMangler inherit AllStatic [v2]

[Kim Barrett]

On Mon, 20 May 2024 21:11:28 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Extract the state for `top` out of `SpaceMangler`. Users (Serial and Parallel GC) already tracks the top before/after GC. The "real" change in this PR are only two places: `serialFullGC.cpp` and `PSParallelCompact::post_compact`.
>> 
>> 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 three additional commits since the last revision:
> 
>  - review
>  - Merge branch 'master' into mangle
>  - mangle

Looks good.

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Marked as reviewed by kbarrett (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19279#pullrequestreview-2067060273