[TypeChecker] Fix a crash: Valid typeLoc does not imply nonnull type. rdar://23544224
[TypeChecker] Fix a crash: Valid typeLoc does not imply nonnull type. rdar://23544224

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