[ClangImporter] Don't unique selector names when doing id-style lookup.
[ClangImporter] Don't unique selector names when doing id-style lookup.

Dmitri pointed out that we're just bloating the AST context's identifier
table and not actually saving any string comparison. StringRef's == is
pretty efficient anyway.

Swift SVN r7339

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