RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v33]

[Man Cao]

On Thu, 26 Oct 2023 21:01:53 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:
> 
>   Remove StringDedup from GC thread list

Marked as reviewed by manc (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/15082#pullrequestreview-1700652459