RFR: Expand old on demand [v63]

[Kelvin Nilsen]

On Thu, 25 May 2023 16:47:15 GMT, Kelvin Nilsen <kdnilsen at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoahHeap.hpp line 358:
>> 
>>> 356: 
>>> 357:   // How many full-gc cycles have been completed?
>>> 358:   volatile size_t _completed_fullgc_cycles;
>> 
>> `ShenandoahCollectorPolicy` already counts full GC cycles (implicit and  explicit). We could add a `get_full_gc_count` there without duplicating any functionality.
>
> good idea.  I searched around and couldn't figure out where this was.  I'll pursue this simplification.

I've made this change as suggested by you.

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/248#discussion_r1205944052