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
VladDrake/libyuv,skufog/libyuv,alfahim/libyuv,syoshimu/libyuv,fate-extra/libyuv,KerwinMa/libyuv,hyper123/libyuv,ganzhijie/libyuv,uraran/libyuv,KerwinMa/libyuv,uraran/libyuv,dexcz/libyuv,uditkumawat/libyuv,WangYongHai/libyuv,yzhikan/libyuv,RockySteveJobs/libyuv,syoshimu/libyuv,fate-extra/libyuv,chucvv/libyuv,alfahim/libyuv,gigakuma/libyuv,aberejohn/libyuv,KerwinMa/libyuv,wl-chuang/libyuv,gigakuma/libyuv,bingerZhang/libyuv,OrenHg/libyuv,aberejohn/libyuv,OrenHg/libyuv,chucvv/libyuv,gigakuma/libyuv,dilagurung/libyuv,hajunho/libyuv,syoshimu/libyuv,RockySteveJobs/libyuv,uraran/libyuv,hajunho/libyuv,WangYongHai/libyuv,sathishkumars3/libyuv,alfahim/libyuv,dilagurung/libyuv,StopProducing/libyuv,StopProducing/libyuv,mosterta/libyuv,bingerZhang/libyuv,wl-chuang/libyuv,Vairn/libyuv,dexcz/libyuv,mosterta/libyuv,StopProducing/libyuv,VladDrake/libyuv,wl-chuang/libyuv,uditkumawat/libyuv,mosterta/libyuv,sathishkumars3/libyuv,skufog/libyuv,bingerZhang/libyuv,VladDrake/libyuv,ganzhijie/libyuv,dexcz/libyuv,Vairn/libyuv,fate-extra/libyuv,aberejohn/libyuv,sathishkumars3/libyuv,uditkumawat/libyuv,RockySteveJobs/libyuv,Vairn/libyuv,hyper123/libyuv,yzhikan/libyuv,yzhikan/libyuv,OrenHg/libyuv,hyper123/libyuv,hajunho/libyuv,skufog/libyuv,ganzhijie/libyuv,dilagurung/libyuv,WangYongHai/libyuv,chucvv/libyuv