SIL.rst: Describe some additional needed insns.
SIL.rst: Describe some additional needed insns.

We need 'class_method' and 'super_method' to represent dynamic dispatch on class methods. We also need 'class_metatype' and 'existential_metatype' to obtain the runtime metatypes of class instances and existential containers.

Swift SVN r4321

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