RFR: 8277824: Remove empty RefProcSubPhasesWorkerTimeTracker destructor [v2]

[Albert Mingkun Yang]

On Mon, 29 Nov 2021 10:31:42 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change removing effectively dead code, and some general cleanup.
>> 
>> Test: hotspot_gc
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   review

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6555