disable J422ToARGBRow_AVX2 for gcc/clang due to unittest failure BUG=393 TESTED=libyuvTest.TestFullYUVJ R=bcornell@google.com
disable J422ToARGBRow_AVX2 for gcc/clang due to unittest failure
BUG=393
TESTED=libyuvTest.TestFullYUVJ
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/50379004
flykickbird/libyuv,flykickbird/libyuv,flykickbird/libyuv