RFR: 8236176: Parallel GC SplitInfo comment should be updated for shadow regions [v2]

[Albert Mingkun Yang]

On Mon, 23 Aug 2021 16:07:48 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this small change to add a high-level description of how shadow regions are utilized during the compact phase of the parallel GC. There is no special handling of Splitinfo by the shadow regions; the destination computation and the handling of partial_objects are done during the summary phase while the shadow regions optimization only applies to compaction. 
>> 
>> Additionally, some unused variables are cleaned up.
>
> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Thomas review

Marked as reviewed by ayang (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/5195