Add a dead function elimination pass before we run SIL highlevel optimizations. I see slight compilation time improvements.
Add a dead function elimination pass before we run SIL highlevel optimizations.
I see slight compilation time improvements.

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