Simplify the lookup of a compiler-known library function. NFC.
Simplify the lookup of a compiler-known library function. NFC.

Swift SVN r27157

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