Add a new experiment "rect-intra-pred".
Earlier, intra prediction for rectangular blocks was performed by running two steps of prediction on square sub-blocks. With this experiment, we do proper intra prediction for rectangular blocks. This ensures that we make use of all available neighboring pixels especially for directional modes. For this, all the intra predictors were updated to work with rectangular transform block sizes. Performance improvements are small but free of cost: All Intra frames: lowres: -0.126 midres: -0.154 Video Overall: lowres: -0.043 midres: -0.100 [Could not get AWCY results due to a backlog.] BUG=aomedia:551 Change-Id: I7936e91b171d5c246cb0a4ea470a981a013892e6
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