RFR: 8290966: G1: Record number of PLAB filled and number of direct allocations [v2]

[Thomas Schatzl]

On Thu, 28 Jul 2022 20:29:22 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   kbarrett review
>
> Looks good.  Just a couple whitespace comments.

Thanks @kimbarrett @sangheon for your reviews

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PR: https://git.openjdk.org/jdk/pull/9626