[CSClosure] Mark conjunctions representing closure body as isolated
[CSClosure] Mark conjunctions representing closure body as isolated

Bodies of multi-statement closures should be handled in isolation
because they don't dependent on anything expect parameter/result
types from outer context.

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