Neon version of FilterFar()
Neon version of FilterFar()

The performance gain on a Nexus 7 reported by audioproc is ~3.5%.

The output is bit exact.

BUG=3131
TESTED=verified performance manually, passed trybots
R=bjornv@webrtc.org, cd@webrtc.org, kwiberg@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12799005

Patch from Scott LaVarnway <slavarnw@gmail.com>.

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: d5075bdbb52b8b7d990d2b342e785b1942210e88

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