Separate collecting substitutions in devirtualization.
Separate collecting substitutions in devirtualization.

This is a separate step worthy of its own function.

NFC.

Swift SVN r25793

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