TBR=kjellander@chromium.org
BUG=libyuv:719
TEST=TestGaussCol_NEON

Change-Id: I52cb6dbfd0cab4a30205c93b6a528ef49e9ab529
Reviewed-on: https://chromium-review.googlesource.com/621708Reviewed-by: Cheng Wang <wangcheng@google.com>