[runtime] Fix compiler error with clang-700.
[runtime] Fix compiler error with clang-700.

rdar://19940607.

Swift SVN r25583

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