RFR: 8327365: Inline and remove GCStats [v3]

[Guoxiong Li]

On Wed, 6 Mar 2024 10:51:04 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple refactoring to move a field from superclass to subclass.
>
> 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 five additional commits since the last revision:
> 
>  - review
>  - Merge branch 'master' into s1-flatten-gc-stat
>  - review
>  - Merge branch 'master' into s1-flatten-gc-stat
>  - s1-flatten-gc-stat

Marked as reviewed by gli (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/18122#pullrequestreview-1919407408