[Typechecker] Use early return if the base generic context does not have a generic signature
[Typechecker] Use early return if the base generic context does not have a generic signature

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