Baseline + parallel_deblocking:

- Passed unit tests *SSE2/Loop8Test6*, *AVX2/Loop8Test6*.
- 1080p, 25 frames, profile=0, encoding/decoding, output match.
- Decoder frame rate increases from 54.15 to 65.84.

Change-Id: I55938c94961066594f4b9080192c7268c19d9bf9