RFR: 8260106: Shenandoah: simplify maybe_update_with_forwarded and related code [v2]

[Aleksey Shipilev]

On Wed, 20 Jan 2021 19:50:41 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> Aleksey Shipilev has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Rename maybe to atomic
>>  - Touch up comments
>
> src/hotspot/share/gc/shenandoah/shenandoahHeap.inline.hpp line 120:
> 
>> 118:       shenandoah_assert_not_in_cset_except(p, fwd, cancelled_gc());
>> 119: 
>> 120:       // Sanity check: we are should not be updating the cset regions themselves,
> 
> Typo: excess 'are' (I think)

Resolved, along with a few other touchups.

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