XArray -next inclusion request

[Matthew Wilcox]

Hi Stephen,

Please add

git://git.infradead.org/users/willy/linux-dax.git xarray

to linux-next.  It is based on -rc1.  You will find some conflicts
against Dan's current patches to DAX; these are all resolved correctly
in the xarray-20180615 branch which is based on next-20180615.

In a masterstroke of timing, I'm going to be on a plane to Tokyo on
Monday.  If this causes any problems, please just ignore the request
for now and we'll resolve it when I'm available to fix problems.