Revert "Disable LLVM's MergeFunctions pass"
Revert "Disable LLVM's MergeFunctions pass"

Renable the merge function pass. The bug in LLVM was fixed.

This reverts commit r28483.

Swift SVN r29045

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