RFR: 8339387: ZGC: Synchronize medium page allocation [v2]

[Stefan Johansson]

On Fri, 6 Sep 2024 08:22:53 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> Stefan Johansson has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Review - use explicit null checks
>>  - StefanK review - change lock type
>
> Looks good! Thanks for fixing.

Thanks for the reviews @fisk, @xmas92 and @stefank.

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PR Comment: https://git.openjdk.org/jdk/pull/20883#issuecomment-2337828395