RFR: Disable redundant generation usage after fullgc

[Kelvin Nilsen]

On Tue, 4 Apr 2023 16:10:28 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> After a recent integration, we ended up recomputing generation usage twice.  This change integrates the two efforts with a single more efficient pass.
>
> src/hotspot/share/gc/shenandoah/shenandoahReferenceProcessor.cpp line 1:
> 
>> 1: /*
> 
> Do you want to leave this out of this PR? It's somewhat unrelated and there is a separate PR for it: https://github.com/openjdk/shenandoah/pull/241

I'll remove this.  thanks.  (i had to comment out asserts to pass regression tests.)

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/242#discussion_r1157491284