RFR: 8273590: Move helper classes in G1 post evacuation sub tasks to cpp files

[Thomas Schatzl]

On Tue, 21 Sep 2021 22:24:07 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Hi all,
>> 
>>   can I have reviews for this straightforward refactoring, moving helper classes that are not required to .cpp files. The nice side effect of this is that it removes around 100 LOC. No changes to code, except for removal of one unused local variable in
>> ```RemoveSelfForwardPtrsTask::~RemoveSelfForwardPtrsTask`.
>> 
>> Testing: compilation, gha, local jtreg/gc/g1
>> 
>> Thanks,
>>   Thomas
>
> Looks good.

Thanks @kimbarrett @kstefanj for your reviews

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PR: https://git.openjdk.java.net/jdk/pull/5461