RFR: 8154753: Turn G1Policy into an interface

[Thomas Schatzl]

Hi Erik,

On Fri, 2016-04-22 at 13:45 +0200, Erik Helin wrote:
> Hi all,
> 
> this patch refactors the class G1Policy into an interface and moves
> the
> implementation to G1DefaultPolicy.
> 
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8154753
> 
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8154753/webrev.00/
> 
> Testing:
> - JPRT
> - GCBasher

  seems good.

Given that in private conversation you mentioned that some cleanups are
coming, ship it.

Thanks,
  Thomas