AVX2 SubPixel AVG Variance Optimization
Optimizing 2 functions to process 32 elements in parallel instead of 16: 1. vp9_sub_pixel_avg_variance64x64 2. vp9_sub_pixel_avg_variance32x32 both of those function were calling vp9_sub_pixel_avg_variance16xh_ssse3 instead of calling that function, it calls vp9_sub_pixel_avg_variance32xh_avx2 that is written in avx2 and process 32 elements in parallel. This Optimization gave 80% function level gain and 2% user level gain Change-Id: Iea694654e1b7612dc6ed11e2626208c2179502c8
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