RFR: 8261356: Clean up enum G1Mark [v2]

Tue Feb 9 13:30:11 UTC 2021

On Tue, 9 Feb 2021 12:45:51 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> After removing the effectively dead entry in `G1Mark`, the whole enum could be turned into a bool. The call-chain is updated and existing comments are revised.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Lgtm after fixing that indentation issue.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2461