RFR: 8280374: G1: Remove unnecessary prev bitmap mark [v2]

[Hamlin Li]

On Fri, 21 Jan 2022 12:52:17 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> In JDK-8278917, the prev bitmap is used to mark evac failure objs, so at the post of evacuation, the evacuation failure objects are already marked during pss evacuation, so there is no need to mark them again in remove self forwardee phase.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Thomas review

> Just for my own understanding, the removed line (L136) could have been an assert that bits for `mr` are _not_ set, right?

Agree, I will add assert. Thanks

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PR: https://git.openjdk.java.net/jdk/pull/7153