vp9: Encoding cycle reduction for speed 8.
1. Skip golden non-zeromv and newmv-last for bsize >= 16x16 if the temporal variance obtained from choose_partitioning is very low. 2. Skip horz and vert INTRA mode for speed 8. This change works best on the clips with little noise and with some motion (e.g. gips_motion which has > 5% speed up). PSNR drop is 1.78% on rtc test set, no obvious visual quality regression found. Change-Id: Ib43b5b20e67809d03c5a6890818ddff59e1fc94a
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