SILGen: Eliminate the notion of 'extra call sites'
SILGen: Eliminate the notion of 'extra call sites'

Now that curry thunks are gone, we can do a bit more refactoring
to guarantee that an ApplyExpr always has the *exact* number of
call sites expected.

Extra call sites are handled by emitting the innermost ApplyExpr
as an indirect callee, eliminating a special code path.

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