RFR: 8277825: Remove unused ReferenceProcessorPhaseTimes::_sub_phases_total_time_ms

[Albert Mingkun Yang]

On Thu, 25 Nov 2021 09:57:17 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing effectively dead code.
> 
> Test: build

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6557