[driver] Do not issue an error if one of the multiple top-level outputs is a swiftmodule.
[driver] Do not issue an error if one of the multiple top-level outputs is a swiftmodule.

This will occur if -emit-{library,executable} and -emit-module is passed but -g
is not, since both the LinkJobAction and the MergeModuleJobAction will be
top-level actions.

Swift SVN r13139

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