IRGen: Remove erroneous assertion.
IRGen: Remove erroneous assertion.

Thick metatype casts don't require ObjC interop.

Swift SVN r27413

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