Add a test that we don't crash when someone imports "Swift" instead of "swift".
Add a test that we don't crash when someone imports "Swift" instead of "swift".

We still get things pretty wrong when the wrong module is found because
of a case-insensitive filesystem, but we can deal with that later.

<rdar://problem/15632996>

Swift SVN r12608

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