Track overload sets with constraint locators rather than constraints or expressions.
Track overload sets with constraint locators rather than constraints or expressions.

Using locators to track overload sets makes it far easier to relate a
particular overload set back to an expression (which was previously a
bit more hacky) and relate overload sets among different branches in
the solution space.

This commit also fixes the ListMaker build regression that nobody else
noticed.





Swift SVN r4367

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