RFR: 8294845: Make globals accessed by G1 young gen revising atomic [v2]

[Thomas Schatzl]

On Wed, 2 Nov 2022 06:52:59 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   remove superfluous casts
>
> Looks good.

Thanks @kimbarrett @walulyai for your reviews

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PR: https://git.openjdk.org/jdk/pull/10845