Disable allow_partition_search_skip for speed 2.
When allow_partition_search_skip is set the two pass code can optionally skip the partition search in the rd loop if the image appears static (based on selection of 0,0 motion). Unfortunately 0,0 motion does not necessarily mean that there are no meaningful changes or that motion or intra modes will not be selected in the second pass. Disabling "allow_partition_search_skip" may hurt the encode speed a little for a small number of clips but can have a big impact on compression. The most notable example of this in our test sets is "bridge_close_cif" where this change gives a gains of 18%, 12% and 16% in opsnr, ssim and psnr-hvs. Change-Id: I765e288b5c0cd82bce00a148e7653a21e9203024
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