[ConstraintSystem] Make sure that invalid state is always diagnosed via fallback diagnostic
[ConstraintSystem] Make sure that invalid state is always diagnosed via fallback diagnostic

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