Compression gain:
AWCY
PSNR	PSNR HVS	SSIM	CIEDE 2000
-0.42	-0.15   	-0.38	-0.62

Google testsets
lowres -0.18%
midres -0.32%

No obvious encoding speed changes observed.

Change-Id: I888cf4b22b591d79d80b2d77c9eb10d84e5de722