8266abfe96
Further changes to make experiments with the context used for coding the dual pred flag easier. Current best performing method tested on derf is a two element context based on reference frame. I also tried various combinations of mode and reference frame as shown in commented out case using up to 6 contexts. Derf +0.26 overall psnr +0.15% ssim vs original method. Change-Id: I64c21ddec0abbb27feaaeaa1da2e9f164ebaca03