RFR: 8327000: GenShen: Integrate updated Shenandoah implementation of FreeSet into GenShen [v15]

[Y. Srinivas Ramakrishna]

On Wed, 19 Jun 2024 18:57:46 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> The mainline implementation of ShenandoahFreeSet was recently updated.  This PR integrates the upstream changes
>> into Generational Shenandoah.
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Only increment gc_no_progess count following back-to-back failed fullgc

I think that's most of my comments. Looks mostly good otherwise, so I'm approving, but let me know if you should need a quick re-review for any substantive changes stemming from reviews (with the caveat that I might not get to rereview before Tuesday June 25 on account of PTO).

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Marked as reviewed by ysr (Committer).

PR Review: https://git.openjdk.org/shenandoah/pull/440#pullrequestreview-2129204039