RFR: 8139883: Add virtual destructor G1ParScanThreadState

[Thomas Schatzl]

Hi Erik,

On Tue, 2015-11-10 at 11:23 +0100, Erik Helin wrote:
> Hi all,
> 
> this small patchs add a virtual destructor to G1ParScanThreadState to
> enable proper subclassing.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8139883
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8139883/webrev.00/
> 

  looks good.

Thomas