RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v19]

[David Holmes]

On Sat, 16 Sep 2023 00:16:26 GMT, Jonathan Joo <jjoo at openjdk.org> wrote:

>> 8315149: Add hsperf counters for CPU time of internal GC threads
>
> Jonathan Joo has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Address dholmes@ comments

Thanks for updates.

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PR Review: https://git.openjdk.org/jdk/pull/15082#pullrequestreview-1630202692