RFR: 8332517: G1: Refactor G1AllocRegion [v4]

[Thomas Schatzl]

On Tue, 2 Jul 2024 13:10:46 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this refactoring change to move `_used_bytes_before` out of the base class and into the only child class G1GCAllocRegion that requires those details.
>> 
>> Additionally, I removed wrapper methods that do not seem to improve readability in anyway.
>> 
>> Testing: Tier 1-3
>
> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Thomas Review

Marked as reviewed by tschatzl (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/19902#pullrequestreview-2153968476