Keep track of the number of supertype fallbacks.
Keep track of the number of supertype fallbacks.

This is interesting because most supertype fallbacks come from our
current inability to compute meets or joins to come up with a
definitive answer, so this statistic quantifies (in some sense) the
cost of these failures.


Swift SVN r3118

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