[stdlib] Tests shouldn't use internal entry points
[stdlib] Tests shouldn't use internal entry points

There's no reason not to test the actual casting syntax here.

Swift SVN r20703

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