RFR: 8265435: Remove dummy lists in G1CalculatePointersClosure [v2]

[Albert Mingkun Yang]

On Tue, 20 Apr 2021 08:59:37 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Remove the dummy list and some general cleanup.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/3568