GSB: Force PotentialArchetypes for associated types with no requirements
GSB: Force PotentialArchetypes for associated types with no requirements

This doesn't actually matter, except to make requirement machine
minimization cross-checking work on highly invalid code with
duplicate associated type declarations in the same protocol.

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