[ConstraintSystem] Avoid applying invalid solution with fixes
[ConstraintSystem] Avoid applying invalid solution with fixes

If solution score indicates that there should be a fix but
none where recorded fail solution application and produce
a fallback diagnostic to pin-point a problem.

Resolves: rdar://problem/60663007

gregomni/swift,jmgc/swift,stephentyrone/swift,atrick/swift,gregomni/swift,CodaFi/swift,parkera/swift,benlangmuir/swift,airspeedswift/swift,aschwaighofer/swift,xwu/swift,parkera/swift,xwu/swift,CodaFi/swift,airspeedswift/swift,jckarter/swift,stephentyrone/swift,apple/swift,harlanhaskins/swift,glessard/swift,ahoppen/swift,roambotics/swift,allevato/swift,allevato/swift,ahoppen/swift,stephentyrone/swift,rudkx/swift,tkremenek/swift,jmgc/swift,ahoppen/swift,aschwaighofer/swift,atrick/swift,benlangmuir/swift,gregomni/swift,atrick/swift,parkera/swift,parkera/swift,jckarter/swift,tkremenek/swift,hooman/swift,nathawes/swift,airspeedswift/swift,ahoppen/swift,glessard/swift,tkremenek/swift,glessard/swift,aschwaighofer/swift,hooman/swift,atrick/swift,apple/swift,tkremenek/swift,jmgc/swift,xwu/swift,JGiola/swift,gregomni/swift,allevato/swift,parkera/swift,JGiola/swift,hooman/swift,jmgc/swift,glessard/swift,hooman/swift,benlangmuir/swift,JGiola/swift,apple/swift,JGiola/swift,ahoppen/swift,gregomni/swift,CodaFi/swift,rudkx/swift,harlanhaskins/swift,jckarter/swift,apple/swift,roambotics/swift,CodaFi/swift,nathawes/swift,jckarter/swift,aschwaighofer/swift,nathawes/swift,rudkx/swift,rudkx/swift,CodaFi/swift,airspeedswift/swift,allevato/swift,allevato/swift,harlanhaskins/swift,parkera/swift,nathawes/swift,stephentyrone/swift,harlanhaskins/swift,harlanhaskins/swift,stephentyrone/swift,xwu/swift,JGiola/swift,hooman/swift,CodaFi/swift,jckarter/swift,atrick/swift,glessard/swift,allevato/swift,nathawes/swift,nathawes/swift,benlangmuir/swift,aschwaighofer/swift,airspeedswift/swift,harlanhaskins/swift,apple/swift,CodaFi/swift,tkremenek/swift,stephentyrone/swift,stephentyrone/swift,jckarter/swift,roambotics/swift,nathawes/swift,allevato/swift,ahoppen/swift,airspeedswift/swift,xwu/swift,roambotics/swift,JGiola/swift,gregomni/swift,aschwaighofer/swift,benlangmuir/swift,rudkx/swift,roambotics/swift,hooman/swift,tkremenek/swift,atrick/swift,jmgc/swift,apple/swift,hooman/swift,jmgc/swift,parkera/swift,benlangmuir/swift,airspeedswift/swift,parkera/swift,glessard/swift,xwu/swift,tkremenek/swift,jckarter/swift,harlanhaskins/swift,xwu/swift,aschwaighofer/swift,rudkx/swift,roambotics/swift,jmgc/swift