RFR: 8260106: Shenandoah: simplify maybe_update_with_forwarded and related code [v3]

[Aleksey Shipilev]

On Fri, 22 Jan 2021 15:51:06 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:
>> 
>>  - Simplify further after RESOLVE removal
>>  - Merge branch 'master' into JDK-8260106-shenandoah-simplify-updates
>>  - Rename maybe to atomic
>>  - Touch up comments
>>  - 8260106: Shenandoah: simplify maybe_update_with_forwarded and related code
>
> Looks good to me! Thanks!

This kinda keeps creeping: I just realized we need to sweep in the "normal" update references in the same thing. I'll make this a draft and keep working on it.

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PR: https://git.openjdk.java.net/jdk/pull/2166