Runtime: Provide implementations of opaque existential witnesses.
Runtime: Provide implementations of opaque existential witnesses.

Instantiate static value witness implementations for the common zero- and one-witness-table cases, which correspond to the "Any" type protocol<> and to single-protocol types. For protocol compositions, instantiate a value witness table that uses the layout information from existential metadata to perform the value witness operations.

Swift SVN r9752

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