RFR: JDK-8289182: NMT: MemTracker::baseline should return void [v2]

[Thomas Stuefe]

On Tue, 28 Jun 2022 13:47:46 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> Thomas Stuefe has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains one commit:
>> 
>>   let MemTracker::baseline return void
>
> LGTM

Thanks @zhengyu123 and @dholmes-ora

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PR: https://git.openjdk.org/jdk/pull/9288