Allow for H and V intra modes for non-rd mode.
For non-rd mode (speed >=5): use mask based on prediction block size, and (for non-screen content mode) allow for checking horiz and vert intra modes for blocks sizes < 16x16. Avg psnr/ssim metrics go up by about ~0.2%. Only allowing H/V intra on block sizes below 16x16 for now, to keep encoding time increase very small, and also when allowing H/V on 16x16 blocks, metrics went down on a few clips which need to be further examined. Change-Id: I8ae0bc8cb2a964f9709612c76c5661acaab1381e
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