RFR: 8367708: GenShen: Reduce total evacuation burden [v2]

[Kelvin Nilsen]

On Tue, 16 Sep 2025 19:19:19 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> There's a comment in the "new code" that we have to reclaim from the tail.  Otherwise assertion fails when printing region to trace log. 
>> 
>> I agree it is unclear how this relates to current PR.  I'll revert and see if something breaks.
>
> Thanks. We talked about this comment in the original PR: https://github.com/openjdk/jdk/pull/26256. It's a stale comment. I ran a pipeline with `gc*=trace` (and also inspected all usages).

Running this change through test pipelines.  Perhaps the original problem that I had encountered was fixed in a different way upstream, and my change was no longer necessary or relevant after merging from upstream.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27278#discussion_r2353485278