Remove isClassDeclOracle.
Remove isClassDeclOracle.

The only use of this was not terribly useful as an early-out since we
immediately test for two of the three cases.

At some point we can extend the code to actually walk back through
projections, but until then this just seems like noise.

Swift SVN r25668

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