Temporary fix for 4X8 block intra prediction.
Currently the RD loop traverses 4X8 blocks in inverted N order while the bitstream stores blocks smaller than 8x8 in Z order. This causes a discrepancy where the RD loop reads uninitialized data while performing intra prediction. As a temporary fix simply disable the use of the extended right edge for 4X8 blocks, until the bitstream can be changed to match the logical structure of the blocks. Change-Id: I44a9e4fc1a15cd551a7b38c3c1227bc5dac77e9a
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