Debug Info: Provide a workaround for unary let values and that get hit by rdar://problem/15525728 and store them in shadow allocas at -O0.
Debug Info: Provide a workaround for unary let values and
that get hit by rdar://problem/15525728 and store them in shadow allocas
at -O0.

Swift SVN r18276

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