RFR: Recompute generation accounts after fullgc [v3]

[William Kemper]

On Thu, 30 Mar 2023 14:37:31 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> This fix addresses a problem found during verification following full gcs.  This recomputes the generation usage at the end of full GC as part of a 5th phase of full gc.
>> 
>> We may be able to remove this 5th phase at a later time after we find and fix whatever errors exist in generation accounting in the existing full gc implementation.
>
> Kelvin Nilsen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   More efficiently handle each humongous object in Full GC

Marked as reviewed by wkemper (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/235#pullrequestreview-1365410420