Add a compile_swift_NAME target to avoid rebuilding .o files
Add a compile_swift_NAME target to avoid rebuilding .o files

Depending on the output .o file is not sufficient, since in a Makefile
build, the static and dynamic library builds will be in different
invocations of make, so we may build the .o twice in parallel if we
don't have the target dependency.  Not only is that wasteful, but swift
doesn't currently do this atomically, so we can get corrupt objects.

Swift SVN r20280

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