[swift2objc] Check the generated headers with -fsyntax-only.
[swift2objc] Check the generated headers with -fsyntax-only.

Swift SVN r13619

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