RFR: 8272629: G1: simplify G1GCParPhaseTimesTracker constructor API

[Albert Mingkun Yang]

On Wed, 18 Aug 2021 10:31:29 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing an always-true argument in `G1GCParPhaseTimesTracker`.
> 
> Test: hotspot_gc

Yes, you are right. I overlooked it. I will close this PR and the ticket.

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PR: https://git.openjdk.java.net/jdk/pull/5162