intrapred: sync highbd_d135_predictor w/d135_
intrapred: sync highbd_d135_predictor w/d135_

previously:
05437805f intrapred/d135: flatten border results before storing

BUG=webm:1316

Change-Id: I3b8bd89117ad7f2f4560b57f7c148da781e86f85

webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx,webmproject/libvpx