Add iOS ARM64 and XCode 6.1 to default trybots.
Add iOS ARM64 and XCode 6.1 to default trybots.

TBR=fbarchard@google.com
BUG=libyuv:370

Review URL: https://webrtc-codereview.appspot.com/32619004

git-svn-id: a51711482b6ba0e1d1ab095578a045eeae45ac9a@1187 16f28f9a-4ce2-e073-06de-1de4eb20be90

lemenkov/libyuv,lyx2014/yuv,godghdai/libyuv,xlncz/libyuv,disigma/yuv,godghdai/libyuv,godghdai/libyuv,okumura/libyuv,labdong801/libyuv,xlncz/libyuv,Bilibili/libyuv,lyx2014/yuv,yarrcc/libyuv-ios,okumura/libyuv,lyx2014/yuv,PeterXu/libyuv,yarrcc/libyuv-ios,yarrcc/libyuv-ios,Bilibili/libyuv,lemenkov/libyuv,PeterXu/libyuv,lyx2014/libyuv_free,PeterXu/libyuv,disigma/yuv,lyx2014/libyuv_free,jpxiong/libyuv,lyx2014/libyuv_free,lyx2014/libyuv_free,jpxiong/libyuv,jpxiong/libyuv,disigma/yuv,lyx2014/yuv,yarrcc/libyuv-ios,labdong801/libyuv,Bilibili/libyuv,xlncz/libyuv,lemenkov/libyuv,xlncz/libyuv,okumura/libyuv,lemenkov/libyuv,labdong801/libyuv