Reinstate workaround for rdar://14897572 (slow arm64 compilation)
Reinstate workaround for rdar://14897572 (slow arm64 compilation)


Swift SVN r8318

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