ref: d217c87139a3218d9dc4154782de53b9d0cc1119
parent: e7cac130167c1da6d17caa33e216250d989d0fe8
author: Johann <johannkoenig@google.com>
date: Mon May 15 12:30:00 EDT 2017
neon variance: special case 4x The sub pixel variance uses a temp buffer which guarantees width == stride. Take advantage of this with the 4x and avoid the very costly lane loads. Change-Id: Ia0c97eb8c29dc8dfa6e51a29dff9b75b3c6726f1