[Test] Added test for try_apply barrier.
[Test] Added test for try_apply barrier.

ahoppen/swift,JGiola/swift,apple/swift,benlangmuir/swift,ahoppen/swift,benlangmuir/swift,glessard/swift,rudkx/swift,JGiola/swift,glessard/swift,glessard/swift,gregomni/swift,apple/swift,atrick/swift,rudkx/swift,apple/swift,benlangmuir/swift,rudkx/swift,roambotics/swift,rudkx/swift,gregomni/swift,roambotics/swift,apple/swift,JGiola/swift,glessard/swift,ahoppen/swift,ahoppen/swift,atrick/swift,rudkx/swift,gregomni/swift,benlangmuir/swift,benlangmuir/swift,JGiola/swift,ahoppen/swift,roambotics/swift,JGiola/swift,apple/swift,atrick/swift,gregomni/swift,JGiola/swift,glessard/swift,glessard/swift,atrick/swift,ahoppen/swift,rudkx/swift,roambotics/swift,apple/swift,roambotics/swift,atrick/swift,gregomni/swift,benlangmuir/swift,atrick/swift,gregomni/swift,roambotics/swift