RFR: Pack old evacuations tightly [v2]

[Kelvin Nilsen]

On Fri, 24 Jun 2022 18:59:55 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp line 1022:
>> 
>>> 1020: void ShenandoahHeap::retire_plab(PLAB* plab) {
>>> 1021:   if (!mode()->is_generational()) {
>>> 1022:     plab->retire();
>> 
>> Do we have plabs in the other modes?
>
> PLABs only exist in generational mode

I should fix this.  sorry

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PR: https://git.openjdk.org/shenandoah/pull/145