Add arm64 code for intra-pred
Refine some code
enable MB re-decoding
Merge pull request #995 from huili2/permit_mb_re-con

enable MB re-decoding
Merge pull request #990 from zhilwang/arm64-intrapred

Add Arm64 neon Intra-pred code
Merge remote-tracking branch 'upstream/master' into travis.android