RFR: 8267767: Redundant condition check in SafepointSynchronize::thread_not_running

[David Holmes]

On Thu, 25 Nov 2021 07:54:36 GMT, David Holmes <dholmes at openjdk.org> wrote:

> As per the discussion in the JBS issue this adds a comment and some logging to the second condition check.
> 
> Testing: tiers 1-5 builds only (no tests as no functional changes)
> 
> Thanks,
> David

@albertnetymk  please review. Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/6552