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

[earthling-amzn]

On Mon, 1 Mar 2021 14:08:52 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/shenandoahOldGC.cpp line 1:
> 
>> 1: #include "precompiled.hpp"
> 
> Missing copyright header here.

Fixed.

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