RFR (XS): 8183127: UpdateRSetDeferred should not enqueue cards for NULL references

[Thomas Schatzl]

Hi Mikael,

On Wed, 2017-07-05 at 10:30 +0200, Mikael Gerdin wrote:
> Hi Thomas,
> 
> On 2017-07-04 17:25, Thomas Schatzl wrote:
> > 
> > Hi,
> > 
> >    can I have reviews for this change that adds a NULL-check in the
> > UpdateRSetDeferred closure so that we do not enqueue cards with
> > NULL
> > references in it during evacuation failure?
> > 
> > CR:
> > https://bugs.openjdk.java.net/browse/JDK-8183127
> > Webrev:
> > http://cr.openjdk.java.net/~tschatzl/8183127/webrev/
> Looks good to me. I agree that the amount of testing seems
> sufficient.

  thanks for your review.

Thomas