Add testcase for fixed circular reference issue: rdar://89921930
Add testcase for fixed circular reference issue: rdar://89921930

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