RFR: 8315149: Add hsperf counters for CPU time of internal GC threads [v46]

[Jonathan Joo]

On Tue, 21 Nov 2023 21:42:39 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:
> 
>  - Update memory tracking type for CPUTimeCounters
>  - Fix assertion logic

Addressed cleanups, PR should be RFR!

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PR Comment: https://git.openjdk.org/jdk/pull/15082#issuecomment-1823609497