Fix the declcontext used to find the extended nominal type
Fix the declcontext used to find the extended nominal type

This should not start searching at the extension.  Start looking one
level up.  Breaks a potential cycle where an extension's generic
parameters were subject to lookup while computing the nominal type.

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