Make sure we have a local context when parsing top-level code.
Make sure we have a local context when parsing top-level code.

... even if that code is invalid. Eliminates a crash found as part of
<rdar://problem/15059074>.


Swift SVN r11869

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