Use defined() instead of using a possibly not defined macra
Use defined() instead of using a possibly not defined macra

Swift SVN r23229

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