SILGen: Clean up curry thunk emission a bit
SILGen: Clean up curry thunk emission a bit

NFC for now, but by not looking at the FunctionType of the AST Decl,
we no longer pass an InOutType to type lowering here, which won't be
supported soon.

airspeedswift/swift,sschiau/swift,roambotics/swift,hooman/swift,hooman/swift,airspeedswift/swift,xwu/swift,rudkx/swift,xedin/swift,devincoughlin/swift,allevato/swift,austinzheng/swift,danielmartin/swift,shajrawi/swift,atrick/swift,gregomni/swift,jmgc/swift,xwu/swift,danielmartin/swift,parkera/swift,gregomni/swift,airspeedswift/swift,tkremenek/swift,devincoughlin/swift,shajrawi/swift,shahmishal/swift,lorentey/swift,xwu/swift,stephentyrone/swift,lorentey/swift,jmgc/swift,natecook1000/swift,xedin/swift,airspeedswift/swift,CodaFi/swift,devincoughlin/swift,practicalswift/swift,gribozavr/swift,xedin/swift,parkera/swift,jmgc/swift,karwa/swift,shahmishal/swift,stephentyrone/swift,glessard/swift,natecook1000/swift,natecook1000/swift,jckarter/swift,rudkx/swift,roambotics/swift,jckarter/swift,allevato/swift,shahmishal/swift,nathawes/swift,aschwaighofer/swift,brentdax/swift,lorentey/swift,rudkx/swift,atrick/swift,alblue/swift,stephentyrone/swift,brentdax/swift,lorentey/swift,karwa/swift,benlangmuir/swift,aschwaighofer/swift,natecook1000/swift,alblue/swift,shajrawi/swift,xedin/swift,shajrawi/swift,karwa/swift,sschiau/swift,practicalswift/swift,airspeedswift/swift,nathawes/swift,natecook1000/swift,ahoppen/swift,amraboelela/swift,atrick/swift,ahoppen/swift,hooman/swift,apple/swift,xwu/swift,gribozavr/swift,alblue/swift,allevato/swift,aschwaighofer/swift,xwu/swift,sschiau/swift,shahmishal/swift,nathawes/swift,alblue/swift,austinzheng/swift,airspeedswift/swift,sschiau/swift,JGiola/swift,karwa/swift,ahoppen/swift,alblue/swift,benlangmuir/swift,glessard/swift,amraboelela/swift,amraboelela/swift,hooman/swift,brentdax/swift,shajrawi/swift,shajrawi/swift,ahoppen/swift,austinzheng/swift,nathawes/swift,devincoughlin/swift,sschiau/swift,practicalswift/swift,roambotics/swift,harlanhaskins/swift,jopamer/swift,atrick/swift,sschiau/swift,practicalswift/swift,alblue/swift,aschwaighofer/swift,jmgc/swift,ahoppen/swift,practicalswift/swift,danielmartin/swift,parkera/swift,hooman/swift,brentdax/swift,benlangmuir/swift,gribozavr/swift,austinzheng/swift,tkremenek/swift,jckarter/swift,benlangmuir/swift,harlanhaskins/swift,stephentyrone/swift,CodaFi/swift,shahmishal/swift,allevato/swift,allevato/swift,jckarter/swift,glessard/swift,roambotics/swift,apple/swift,glessard/swift,tkremenek/swift,atrick/swift,nathawes/swift,JGiola/swift,aschwaighofer/swift,gribozavr/swift,glessard/swift,amraboelela/swift,tkremenek/swift,tkremenek/swift,roambotics/swift,danielmartin/swift,harlanhaskins/swift,gribozavr/swift,tkremenek/swift,jmgc/swift,apple/swift,airspeedswift/swift,jckarter/swift,apple/swift,practicalswift/swift,parkera/swift,jopamer/swift,brentdax/swift,shahmishal/swift,lorentey/swift,jmgc/swift,amraboelela/swift,CodaFi/swift,devincoughlin/swift,harlanhaskins/swift,gribozavr/swift,karwa/swift,xedin/swift,CodaFi/swift,gregomni/swift,practicalswift/swift,xwu/swift,danielmartin/swift,parkera/swift,brentdax/swift,gregomni/swift,roambotics/swift,JGiola/swift,amraboelela/swift,jckarter/swift,aschwaighofer/swift,hooman/swift,shahmishal/swift,glessard/swift,jopamer/swift,shajrawi/swift,lorentey/swift,harlanhaskins/swift,natecook1000/swift,amraboelela/swift,jmgc/swift,jopamer/swift,austinzheng/swift,nathawes/swift,danielmartin/swift,JGiola/swift,parkera/swift,gribozavr/swift,jopamer/swift,natecook1000/swift,karwa/swift,nathawes/swift,austinzheng/swift,gregomni/swift,karwa/swift,stephentyrone/swift,parkera/swift,aschwaighofer/swift,stephentyrone/swift,shajrawi/swift,sschiau/swift,devincoughlin/swift,jopamer/swift,atrick/swift,stephentyrone/swift,xwu/swift,harlanhaskins/swift,danielmartin/swift,parkera/swift,benlangmuir/swift,CodaFi/swift,rudkx/swift,harlanhaskins/swift,devincoughlin/swift,alblue/swift,rudkx/swift,jckarter/swift,lorentey/swift,benlangmuir/swift,sschiau/swift,tkremenek/swift,shahmishal/swift,brentdax/swift,apple/swift,gribozavr/swift,ahoppen/swift,apple/swift,JGiola/swift,lorentey/swift,xedin/swift,hooman/swift,xedin/swift,karwa/swift,devincoughlin/swift,xedin/swift,practicalswift/swift,jopamer/swift,CodaFi/swift,JGiola/swift,allevato/swift,CodaFi/swift,austinzheng/swift,allevato/swift,rudkx/swift,gregomni/swift