RFR: 8258431: Provide a JFR event with live set size estimate

[Jaroslav Bachorik]

On Mon, 1 Mar 2021 14:03:37 GMT, Jaroslav Bachorik <jbachorik at openjdk.org> wrote:

>> src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp line 579:
>> 
>>> 577:     event.set_heapLive(heap->live());
>>> 578:     event.commit();
>>> 579:   }
>> 
>> On the first sight, this belongs in `ShenandoahConcurrentMark::finish_mark()`. Placing the event here would fire the event when concurrent GC is cancelled, which is not what you want.
>
> ��

Actually, this shouldn't even be here. `EventGCHeapSummary` is emitted via `trace_heap*` calls which should already be hooked into Shenandoah. Let me remove this.

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PR: https://git.openjdk.java.net/jdk/pull/2579