RFR: JDK-8260236: better init AnnotationCollector _contended_group

[Coleen Phillimore]

On Tue, 26 Jan 2021 08:51:23 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The class AnnotationCollector misses to initialize _contended_group in the constructor, that should be adjusted.
> 
> See also the related sonar warning ( 1 uninitialized field at the end of the constructor call):
> https://sonarcloud.io/project/issues?id=jdk&open=AXaE0c1g8L9hkQskF8qX&resolved=false&types=BUG
> 
> Thanks, Matthias

Looks good + trivial.  Thank you for fixing these!

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Marked as reviewed by coleenp (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2231