RFR: 8151594: Move concurrent refinement thread activation logging out of GC pause

[Thomas Schatzl]

On Thu, 25 Nov 2021 05:56:30 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this move of the thread activation logging by concurrent
> refinment threads to be within the suspendible thread set context, rather
> than before it.  This prevents the logging for the thread activation
> sometimes being intermixed with GC pause-time logging.
> 
> Testing:
> mach5 tier1

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6551