Fix ptrauth in RelativeDirectPointer to sign *then* cast (#41355)
Fix ptrauth in RelativeDirectPointer to sign *then* cast (#41355)


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