Remove unused -enable-availability-checking-in-implicit-functions frontend flag
Remove unused -enable-availability-checking-in-implicit-functions frontend flag

This was for staging in functionality that is now always on.

Swift SVN r30384

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