stdlib: fix warnings
stdlib: fix warnings

Swift SVN r30566

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