HammingDistance_NEON optimized looping
HammingDistance_NEON optimized looping

BenchmarkHammingDistance_Opt (93 ms)
BenchmarkHammingDistance_C (389 ms)

TBR=kjellander@chromium.org
BUG=libyuv:701
TEST=BenchmarkHammingDistance

Change-Id: I4ba920751eb130cac6a276e441a7c309c495554a
Reviewed-on: https://chromium-review.googlesource.com/526401
Reviewed-by: Frank Barchard <52415189a3f67d375195cbbb6fdb1f1759498e57@google.com>
Reviewed-by: Cheng Wang <92a840dd84c11ec2f12edfeb28e694a62b5c28e2@google.com>
Commit-Queue: Frank Barchard <52415189a3f67d375195cbbb6fdb1f1759498e57@google.com>

lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv,lemenkov/libyuv