RFR: Disable redundant generation usage after fullgc

[William Kemper]

On Tue, 4 Apr 2023 15:15:42 GMT, Kelvin Nilsen <kdnilsen 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

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/242#discussion_r1157478937