Use a work list when running function passes.
Use a work list when running function passes.

Rather than iterating over an array of functions, build a work list and
pop functions off of it.

This is a small step towards allowing function passes to create new
functions to be processed.

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