RFR: 8290357: Drop HeapRegion::marked_bytes() [v3]

[Thomas Schatzl]

On Tue, 2 Aug 2022 17:29:45 GMT, Sangheon Kim <sangheki at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:
>> 
>>  - Merge branch 'master' into 8290357-remove-marked-bytes
>>  - Remove actual member and references
>>  - initial version, use live_bytes instead of marked_bytes
>
> Looks good. 
> Just minor nit regarding the remaining comment of _marked_bytes.

Thanks @sangheon @walulyai for your reviews

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PR: https://git.openjdk.org/jdk/pull/9511