SILGen: Handle () and arg-less union cases consistently in the face of substitutions.
SILGen: Handle () and arg-less union cases consistently in the face of substitutions.

Swift SVN r8259

harlanhaskins/swift,IngmarStein/swift,amraboelela/swift,kperryua/swift,KrishMunot/swift,adrfer/swift,Ivacker/swift,kusl/swift,SwiftAndroid/swift,stephentyrone/swift,xedin/swift,practicalswift/swift,hughbe/swift,codestergit/swift,gmilos/swift,jopamer/swift,kstaring/swift,shajrawi/swift,ahoppen/swift,glessard/swift,kusl/swift,sdulal/swift,IngmarStein/swift,zisko/swift,JaSpa/swift,tjw/swift,devincoughlin/swift,shahmishal/swift,ahoppen/swift,sdulal/swift,danielmartin/swift,djwbrown/swift,tjw/swift,huonw/swift,kentya6/swift,gmilos/swift,zisko/swift,practicalswift/swift,uasys/swift,emilstahl/swift,ahoppen/swift,hughbe/swift,LeoShimonaka/swift,practicalswift/swift,huonw/swift,frootloops/swift,sschiau/swift,rudkx/swift,rudkx/swift,rudkx/swift,therealbnut/swift,LeoShimonaka/swift,codestergit/swift,cbrentharris/swift,felix91gr/swift,austinzheng/swift,ken0nek/swift,gottesmm/swift,sschiau/swift,manavgabhawala/swift,SwiftAndroid/swift,dduan/swift,OscarSwanros/swift,adrfer/swift,jmgc/swift,kstaring/swift,hughbe/swift,slavapestov/swift,jopamer/swift,therealbnut/swift,jckarter/swift,khizkhiz/swift,russbishop/swift,gottesmm/swift,jmgc/swift,bitjammer/swift,uasys/swift,arvedviehweger/swift,tinysun212/swift-windows,milseman/swift,felix91gr/swift,SwiftAndroid/swift,IngmarStein/swift,apple/swift,nathawes/swift,brentdax/swift,MukeshKumarS/Swift,Jnosh/swift,nathawes/swift,amraboelela/swift,slavapestov/swift,jtbandes/swift,sschiau/swift,gregomni/swift,glessard/swift,return/swift,gottesmm/swift,SwiftAndroid/swift,jmgc/swift,swiftix/swift,parkera/swift,alblue/swift,ahoppen/swift,JaSpa/swift,mightydeveloper/swift,slavapestov/swift,zisko/swift,shajrawi/swift,nathawes/swift,devincoughlin/swift,tkremenek/swift,deyton/swift,kstaring/swift,bitjammer/swift,KrishMunot/swift,manavgabhawala/swift,jmgc/swift,kentya6/swift,ken0nek/swift,kperryua/swift,return/swift,therealbnut/swift,lorentey/swift,zisko/swift,emilstahl/swift,tjw/swift,tkremenek/swift,slavapestov/swift,stephentyrone/swift,airspeedswift/swift,calebd/swift,arvedviehweger/swift,bitjammer/swift,ken0nek/swift,kusl/swift,jopamer/swift,CodaFi/swift,shahmishal/swift,calebd/swift,harlanhaskins/swift,kentya6/swift,khizkhiz/swift,hooman/swift,dduan/swift,devincoughlin/swift,swiftix/swift,danielmartin/swift,tardieu/swift,karwa/swift,Jnosh/swift,amraboelela/swift,MukeshKumarS/Swift,codestergit/swift,nathawes/swift,jckarter/swift,jckarter/swift,tardieu/swift,jtbandes/swift,austinzheng/swift,emilstahl/swift,khizkhiz/swift,calebd/swift,russbishop/swift,kperryua/swift,return/swift,rudkx/swift,swiftix/swift,codestergit/swift,sdulal/swift,OscarSwanros/swift,kusl/swift,nathawes/swift,modocache/swift,kusl/swift,gribozavr/swift,gribozavr/swift,devincoughlin/swift,lorentey/swift,kstaring/swift,russbishop/swift,alblue/swift,shajrawi/swift,xwu/swift,kperryua/swift,OscarSwanros/swift,adrfer/swift,JGiola/swift,kentya6/swift,atrick/swift,gmilos/swift,swiftix/swift,ken0nek/swift,emilstahl/swift,glessard/swift,apple/swift,aschwaighofer/swift,JaSpa/swift,Ivacker/swift,return/swift,xedin/swift,benlangmuir/swift,xwu/swift,CodaFi/swift,arvedviehweger/swift,hooman/swift,alblue/swift,natecook1000/swift,russbishop/swift,cbrentharris/swift,amraboelela/swift,calebd/swift,calebd/swift,khizkhiz/swift,arvedviehweger/swift,cbrentharris/swift,nathawes/swift,atrick/swift,devincoughlin/swift,MukeshKumarS/Swift,codestergit/swift,parkera/swift,felix91gr/swift,apple/swift,karwa/swift,johnno1962d/swift,xwu/swift,alblue/swift,modocache/swift,deyton/swift,sdulal/swift,ahoppen/swift,ahoppen/swift,aschwaighofer/swift,johnno1962d/swift,OscarSwanros/swift,airspeedswift/swift,brentdax/swift,gribozavr/swift,brentdax/swift,austinzheng/swift,mightydeveloper/swift,karwa/swift,swiftix/swift.old,kstaring/swift,djwbrown/swift,tardieu/swift,atrick/swift,allevato/swift,kperryua/swift,karwa/swift,hooman/swift,huonw/swift,aschwaighofer/swift,tinysun212/swift-windows,therealbnut/swift,xedin/swift,tinysun212/swift-windows,dduan/swift,KrishMunot/swift,practicalswift/swift,JGiola/swift,austinzheng/swift,jopamer/swift,mightydeveloper/swift,sschiau/swift,uasys/swift,milseman/swift,tkremenek/swift,danielmartin/swift,adrfer/swift,arvedviehweger/swift,devincoughlin/swift,tjw/swift,stephentyrone/swift,khizkhiz/swift,Jnosh/swift,deyton/swift,devincoughlin/swift,hooman/swift,manavgabhawala/swift,SwiftAndroid/swift,brentdax/swift,deyton/swift,LeoShimonaka/swift,johnno1962d/swift,russbishop/swift,LeoShimonaka/swift,jmgc/swift,tinysun212/swift-windows,apple/swift,shahmishal/swift,harlanhaskins/swift,kusl/swift,ken0nek/swift,aschwaighofer/swift,zisko/swift,emilstahl/swift,stephentyrone/swift,allevato/swift,MukeshKumarS/Swift,shahmishal/swift,allevato/swift,jopamer/swift,khizkhiz/swift,manavgabhawala/swift,gmilos/swift,SwiftAndroid/swift,Ivacker/swift,natecook1000/swift,frootloops/swift,gmilos/swift,sschiau/swift,kperryua/swift,felix91gr/swift,sdulal/swift,harlanhaskins/swift,huonw/swift,alblue/swift,frootloops/swift,lorentey/swift,lorentey/swift,huonw/swift,therealbnut/swift,atrick/swift,johnno1962d/swift,dduan/swift,karwa/swift,lorentey/swift,milseman/swift,calebd/swift,bitjammer/swift,sdulal/swift,ben-ng/swift,karwa/swift,khizkhiz/swift,harlanhaskins/swift,djwbrown/swift,huonw/swift,adrfer/swift,dduan/swift,gregomni/swift,tjw/swift,OscarSwanros/swift,natecook1000/swift,kentya6/swift,frootloops/swift,adrfer/swift,deyton/swift,swiftix/swift.old,Ivacker/swift,tjw/swift,practicalswift/swift,shajrawi/swift,parkera/swift,danielmartin/swift,JGiola/swift,frootloops/swift,natecook1000/swift,johnno1962d/swift,jckarter/swift,roambotics/swift,ben-ng/swift,danielmartin/swift,tkremenek/swift,LeoShimonaka/swift,benlangmuir/swift,zisko/swift,dduan/swift,mightydeveloper/swift,return/swift,alblue/swift,jopamer/swift,codestergit/swift,aschwaighofer/swift,xedin/swift,austinzheng/swift,gregomni/swift,amraboelela/swift,gottesmm/swift,benlangmuir/swift,sschiau/swift,MukeshKumarS/Swift,amraboelela/swift,devincoughlin/swift,ken0nek/swift,roambotics/swift,stephentyrone/swift,cbrentharris/swift,kentya6/swift,CodaFi/swift,mightydeveloper/swift,kentya6/swift,swiftix/swift.old,karwa/swift,dreamsxin/swift,return/swift,CodaFi/swift,rudkx/swift,shahmishal/swift,parkera/swift,hughbe/swift,xwu/swift,xwu/swift,gribozavr/swift,OscarSwanros/swift,danielmartin/swift,cbrentharris/swift,cbrentharris/swift,tkremenek/swift,KrishMunot/swift,apple/swift,tardieu/swift,hughbe/swift,austinzheng/swift,benlangmuir/swift,bitjammer/swift,IngmarStein/swift,slavapestov/swift,benlangmuir/swift,adrfer/swift,roambotics/swift,Ivacker/swift,sschiau/swift,allevato/swift,kusl/swift,swiftix/swift,xedin/swift,gregomni/swift,deyton/swift,felix91gr/swift,lorentey/swift,slavapestov/swift,ken0nek/swift,alblue/swift,tardieu/swift,uasys/swift,IngmarStein/swift,stephentyrone/swift,Ivacker/swift,allevato/swift,SwiftAndroid/swift,aschwaighofer/swift,slavapestov/swift,ben-ng/swift,xwu/swift,gottesmm/swift,shahmishal/swift,KrishMunot/swift,jtbandes/swift,modocache/swift,Jnosh/swift,benlangmuir/swift,allevato/swift,huonw/swift,mightydeveloper/swift,brentdax/swift,harlanhaskins/swift,LeoShimonaka/swift,airspeedswift/swift,emilstahl/swift,milseman/swift,gribozavr/swift,tardieu/swift,danielmartin/swift,tinysun212/swift-windows,ben-ng/swift,IngmarStein/swift,hooman/swift,gregomni/swift,xedin/swift,arvedviehweger/swift,practicalswift/swift,shajrawi/swift,swiftix/swift,atrick/swift,jmgc/swift,MukeshKumarS/Swift,Ivacker/swift,tkremenek/swift,uasys/swift,gottesmm/swift,emilstahl/swift,glessard/swift,swiftix/swift,apple/swift,gribozavr/swift,ben-ng/swift,frootloops/swift,JaSpa/swift,karwa/swift,ben-ng/swift,JaSpa/swift,tinysun212/swift-windows,mightydeveloper/swift,milseman/swift,tardieu/swift,uasys/swift,swiftix/swift.old,jmgc/swift,practicalswift/swift,mightydeveloper/swift,amraboelela/swift,shahmishal/swift,shajrawi/swift,harlanhaskins/swift,Jnosh/swift,stephentyrone/swift,CodaFi/swift,parkera/swift,OscarSwanros/swift,therealbnut/swift,parkera/swift,djwbrown/swift,gmilos/swift,allevato/swift,codestergit/swift,lorentey/swift,djwbrown/swift,LeoShimonaka/swift,milseman/swift,modocache/swift,jtbandes/swift,hughbe/swift,modocache/swift,jtbandes/swift,emilstahl/swift,shahmishal/swift,frootloops/swift,nathawes/swift,glessard/swift,xwu/swift,parkera/swift,deyton/swift,austinzheng/swift,CodaFi/swift,johnno1962d/swift,gottesmm/swift,djwbrown/swift,russbishop/swift,practicalswift/swift,brentdax/swift,atrick/swift,swiftix/swift.old,modocache/swift,swiftix/swift.old,rudkx/swift,MukeshKumarS/Swift,tjw/swift,dreamsxin/swift,felix91gr/swift,tkremenek/swift,JGiola/swift,kusl/swift,roambotics/swift,bitjammer/swift,jtbandes/swift,Ivacker/swift,lorentey/swift,airspeedswift/swift,cbrentharris/swift,airspeedswift/swift,uasys/swift,manavgabhawala/swift,tinysun212/swift-windows,KrishMunot/swift,jckarter/swift,ben-ng/swift,johnno1962d/swift,roambotics/swift,kperryua/swift,natecook1000/swift,kentya6/swift,IngmarStein/swift,CodaFi/swift,manavgabhawala/swift,calebd/swift,Jnosh/swift,hooman/swift,dduan/swift,brentdax/swift,sdulal/swift,therealbnut/swift,xedin/swift,gribozavr/swift,return/swift,gregomni/swift,cbrentharris/swift,JaSpa/swift,bitjammer/swift,jopamer/swift,gribozavr/swift,Jnosh/swift,glessard/swift,sschiau/swift,jtbandes/swift,roambotics/swift,airspeedswift/swift,airspeedswift/swift,shajrawi/swift,shajrawi/swift,JaSpa/swift,JGiola/swift,swiftix/swift.old,kstaring/swift,modocache/swift,sdulal/swift,milseman/swift,aschwaighofer/swift,djwbrown/swift,LeoShimonaka/swift,parkera/swift,manavgabhawala/swift,gmilos/swift,zisko/swift,russbishop/swift,jckarter/swift,hooman/swift,JGiola/swift,hughbe/swift,jckarter/swift,felix91gr/swift,natecook1000/swift,natecook1000/swift,swiftix/swift.old,arvedviehweger/swift,kstaring/swift,xedin/swift,KrishMunot/swift