IRGen: Emit generic union metadata templates.
IRGen: Emit generic union metadata templates.

At least, do so as poorly as we do for generic structs.

Swift SVN r7548

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