[Async CC] Resigning AFP results in AFP.
[Async CC] Resigning AFP results in AFP.

Previously, when a FunctionPointer whose kind was AsyncFunctionPointer
was resigned, the underlying function pointer was loaded from the
AsyncFunctionPointer struct and that value was signed.  That was
incorrect: a resigned pointer to an AsyncFunctionPointer struct should
again be a pointer to an AsyncFunctionPointer struct.  Here that error
is corrected and the result of resigning is again a pointer to an
AsyncFunctionPointer struct.

jmgc/swift,tkremenek/swift,apple/swift,atrick/swift,xwu/swift,ahoppen/swift,tkremenek/swift,JGiola/swift,jmgc/swift,parkera/swift,JGiola/swift,benlangmuir/swift,parkera/swift,roambotics/swift,glessard/swift,rudkx/swift,xwu/swift,hooman/swift,gregomni/swift,glessard/swift,jmgc/swift,roambotics/swift,gregomni/swift,xwu/swift,ahoppen/swift,benlangmuir/swift,parkera/swift,gregomni/swift,rudkx/swift,rudkx/swift,hooman/swift,parkera/swift,tkremenek/swift,hooman/swift,xwu/swift,hooman/swift,atrick/swift,glessard/swift,tkremenek/swift,rudkx/swift,benlangmuir/swift,xwu/swift,parkera/swift,tkremenek/swift,roambotics/swift,glessard/swift,atrick/swift,glessard/swift,atrick/swift,tkremenek/swift,benlangmuir/swift,atrick/swift,ahoppen/swift,JGiola/swift,parkera/swift,hooman/swift,hooman/swift,JGiola/swift,hooman/swift,rudkx/swift,rudkx/swift,parkera/swift,roambotics/swift,apple/swift,tkremenek/swift,glessard/swift,apple/swift,apple/swift,ahoppen/swift,xwu/swift,jmgc/swift,jmgc/swift,JGiola/swift,parkera/swift,roambotics/swift,gregomni/swift,jmgc/swift,JGiola/swift,atrick/swift,benlangmuir/swift,gregomni/swift,gregomni/swift,ahoppen/swift,apple/swift,ahoppen/swift,jmgc/swift,benlangmuir/swift,roambotics/swift,xwu/swift,apple/swift