ref: aa5a9419926abe3034d1791ed20cca853e5281db
parent: 6bff6cb5a9efe88c2cbe2c5f967560f68ee3ce29
author: Yi Luo <luoyi@google.com>
date: Tue Mar 28 11:30:07 EDT 2017
Add AVX2 optimization to copy/avg functions Change-Id: Ibcef70e4fead74e2c2909330a7044a29381a8074