8191846: jstat prints debug message when debugging is disabled

[Robbin Ehn]

Looks good, Robbin

On 11/24/2017 09:01 AM, Per Liden wrote:
> Hi,
> 
> jstat is designed to handle the case where a perf counter doesn't exits. In the 
> output jstat will then print a "-" instead of the perf counter value to indicate 
> that the counter doesn't exist. However, jstat also prints an unnecessary 
> message, which clobbers the output. This message might still be useful for 
> debugging, but should only be printed when jstat is running with debug messages 
> enabled (-J-DExpressionResolver.debug=true).
> 
> Webrev: http://cr.openjdk.java.net/~pliden/8191846/webrev.0/
> Bug: https://bugs.openjdk.java.net/browse/JDK-8191846
> Testing: hs-tier1, hs-tier2
> 
> /Per