RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v27]

[Jonathan Joo]

On Thu, 5 Oct 2023 03:00:36 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:
> 
>   add comment and change if defined to ifdef

Resolved comments and sanity checks pass on all builds: https://github.com/jjoo172/jdk/actions/runs/6411637099

I believe this PR should be RFR once again.

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PR Comment: https://git.openjdk.org/jdk/pull/15082#issuecomment-1747965305