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In the sub_pixel_avg_variance the parameter sec was also aligned load and
changed to unaligned.

Change-Id: I4d4966e0291059ea4d705baed1503dc58444fcb7

levytamar82 authored Jul 24, 2014 and James Zern committed Aug 07, 2014

in the sub_pixel_*variance* function the dst is aligned to 16 bytes and not
to 32 bytes - now load unaligned data

Change-Id: I2e0b9745543697efc56fefa32857ea10117af135

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

+ fix formatting

Change-Id: I7b4ec11b7b46d8926750e0b69f7a606f3ab80895

Optimizing 2 functions to process 32 elements in parallel instead of 16:
1. vp9_sub_pixel_variance64x64
2. vp9_sub_pixel_variance32x32
both of those function were calling vp9_sub_pixel_variance16xh_ssse3
instead of calling that function, it calls vp9_sub_pixel_variance32xh_avx2
that is written in avx2 and process 32 elements in parallel.
This Optimization gave 70% function level gain and 2% user level gain

Change-Id: I4f5cb386b346ff6c878a094e1c3b37e418e50bde