IRGen: Initialize protocol pointer in FindStructWitnessTableIndex.
IRGen: Initialize protocol pointer in FindStructWitnessTableIndex.

Fixes structs with constrained generic parameters with associated types.

Swift SVN r5056

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