runtime: Don't copy tuple metadata to a local var.
runtime: Don't copy tuple metadata to a local var.

Fixes <rdar://problem/13284728>.

Swift SVN r4197

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