fix lowres padding, which failed to extrapolate the right side for some resolutions.
fix a buffer overread in x264_mbtree_propagate_cost_sse2. no effect on actual behavior, only theoretical correctness. fix x264_slicetype_frame_cost_recalculate on I-frames, which previously used all 0 mb costs. shut up a valgrind warning in predict_8x8_filter_mmx.
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