RFR: Allow young collection to suspend marking in old generation [v14]

[earthling-amzn]

On Mon, 1 Mar 2021 13:56:28 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> earthling-amzn has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - Encode active generation and old generation marking status
>>  - Do not unset preemption request flag prematurely
>>  - Disable reference processing generational mode
>
> src/hotspot/share/gc/shenandoah/shenandoahHeapRegion.cpp line 342:
> 
>> 340:   if (_affiliation == FREE) {
>> 341:     //assert(_live_data == 0, "Setting non-zero live data (%zu) on FREE region", s);
>> 342:   }
> 
> Is this commented-out assert relevant? If not, maybe remove it?

Just left over debugging, removed.

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PR: https://git.openjdk.java.net/shenandoah/pull/19