RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v55]

[Man Cao]

On Sat, 2 Dec 2023 07:37:26 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 two additional commits since the last revision:
> 
>  - Only create CPUTimeCounters if supported
>  - Ensure TTTC is destructed before publishing

Marked as reviewed by manc (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/15082#pullrequestreview-1763690561