Review request: Add barrier set kind for G1 throughput barrier

[Kim Barrett]

On Jan 8, 2015, at 3:09 PM, joe provino <joseph.provino at oracle.com> wrote:
> 
> Can I get reviews for this very small change?
> I also need a sponsor to push the change.
> 
> Webrev and bug report are here:
> 
> http://cr.openjdk.java.net/~jprovino/8064947/webrev.00/
> 
> https://bugs.openjdk.java.net/browse/JDK-8064947
> 
> joe

This change doesn’t really address this part of the bug:

    The ctor should also take an argument specifying the kind, rather than initializing
    _kind to Uninit and requiring derived classes to reassign _kind in their constructors.

There’s more that is supposed to be done, but the CR was insufficiently precise and
explicit about it.