[PtrAuth] Corrected AsyncContextParent schema.
[PtrAuth] Corrected AsyncContextParent schema.

Previously, the schema used a key intended for pointers to code.  An
AsyncContextParent is actually a pointer to data, so that key was
incorrect.  Here, that error is corrected and the schema now uses the
key for pointers to data.

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