Johann 188d58eaa9 sub pel variance neon: 4x block sizes
Add optimizations for blocks of width 4

BUG=webm:1423

Change-Id: Idfb458d36db3014d48fbfbe7f5462aa6eb249938
2017-05-22 14:40:01 -07:00
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2017-05-15 08:29:43 -07:00
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