RFR: 8017163: G1: Refactor remembered sets [v13]

[Thomas Schatzl]

On Thu, 17 Jun 2021 15:49:29 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   sjohanss review - remove debug code
>
> Looked through the changes again and I think they are good. As we have all of JDK 18 to test, polish it and fix any potential problems I see no reason to not approve this now. 
> 
> I found a few unused functions, please remove them unless you have some future plans for any of them.

Thanks @kstefanj @walulyai for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/4116