RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v32]

[Volker Simonis]

On Wed, 25 Oct 2023 20:37:46 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:
> 
>   Use 64-bit atomic add for incrementing counters

Thanks for your patience :)

Looks good to me.

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Marked as reviewed by simonis (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/15082#pullrequestreview-1699438077