RFR (XS) 8210192: Hsperf counter ParNew::CMS should be ParNew:CMS

[Man Cao]

Hi all,

I noticed a possible slight naming bug for the HSPerf counter "
sun.gc.policy.name", introduced by
http://hg.openjdk.java.net/jdk/jdk/rev/170c7b36aea6.

Basically instead of "ParNew:CMS", the counter's value is now "ParNew::CMS".

Here is a fix for the bug, could someone review it?

Webrev: http://cr.openjdk.java.net/~jcbeyler/8210192/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8210192

PS: Thanks JC for creating the bug and hosting the webrev!

Thanks!
Man
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