RFR: 8324981: Shenandoah: Move commit and soft max heap changed methods into heap [v2]

[Aleksey Shipilev]

On Tue, 30 Jan 2024 20:17:47 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> These methods could have been static in control thread because they only interact with the heap. Moving them into the heap reduces code duplication on the generational mode branch.
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Hygene, review feedback

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/17634#pullrequestreview-1853147654