[Distributed] Runtime: Fix retrieval of async pointer from incorrect base
[Distributed] Runtime: Fix retrieval of async pointer from incorrect base

`accessor` represents a record as a whole, which means that async pointer
to the entry point is located at `Function`.

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