RFR: 8267834: Refactor G1CardSetAllocator and BufferNode::Allocator to use a common base class [v3]

[Ivan Walulya]

On Fri, 25 Feb 2022 15:55:49 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Kim review
>
> Looks good.

Thanks @kimbarrett, @tschatzl for your reviews

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PR: https://git.openjdk.java.net/jdk/pull/7615