On SkylakeX for 720p
TestGaussPlane_F32 (657 ms)

On Pixel3
TestGaussPlane_F32 (1787 ms)

Bug: libyuv:852, b/145611468
Change-Id: I9859af1b9381621067992305727da285f82bdded
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/1949667
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
Reviewed-by: Marat Dukhan <maratek@google.com>