RFR (XS): 8142483: Unified logging log instances cause warnings on windows when only static functions are used

[Marcus Larsson]

Hi,

Please review the following small patch to avoid 'unused variable' 
warnings on windows when only static functions are used on a log 
instance. Using log instances like this saves us from specifying the log 
tags for every function call, so it is something we should not warn about.

The patch adds an empty constructor, which means that at least one 
non-static function is called for every log instance, and the warning is 
avoided.

Webrev:
http://cr.openjdk.java.net/~mlarsson/8142483/webrev.00/

Issue:
https://bugs.openjdk.java.net/browse/JDK-8142483

Thanks,
Marcus
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