RFR (M): 8003420: NPG: make new GC root for pd_set

[Thomas Schatzl]

Hi Ioi,

On Wed, 2013-10-02 at 16:37 -0700, Ioi Lam wrote:
> Hi Thomas,
> 
> Looks good.

Thanks for the review.

> 
> I have modified the comments slightly. I originally used the => sign to 
> indicate some sort of mapping, which may be confusing. I think it's 
> better to refer an element of the PD set to be a tuple:

Fixed.

Webrev:
http://cr.openjdk.java.net/~tschatzl/8003420/webrev.2/

(Since this is just a documentation change, I did not do additional
testing than verifying that it still builds locally)

Thomas