SIL.rst: Add descriptions for newly-added insns. Also repaint the "existential" bikeshed since there's a loud preference for talking about existentials as existentials within the implementation.
SIL.rst: Add descriptions for newly-added insns.
Also repaint the "existential" bikeshed since there's a loud preference for talking about existentials as existentials within the implementation.

Swift SVN r3523

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