[ClangImporter] Don't use 'Self?' for a throwing method.
[ClangImporter] Don't use 'Self?' for a throwing method.

We have special logic to handle instancetype returns, but that hadn't
been updated for error handling.

Tested in next commit.

Swift SVN r28978

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