Add regression test for https://bugs.swift.org/browse/SR-15792
Add regression test for https://bugs.swift.org/browse/SR-15792

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