Clarify what it means for a SIL instruction to have side effects.
Clarify what it means for a SIL instruction to have side effects.

Swift SVN r7067

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