[sil-extract] Add a simple test for sil-extract.
[sil-extract] Add a simple test for sil-extract.

*NOTE* I know it may seem a little bit wasteful to have sil-extract included as
a pattern in lit, but I feel it is the right thing to do since it will cause lit
in the fail line to display the full path to sil-extract making it easier to
quickly copy/paste in the shell to fix any issues that may come up.

Swift SVN r11396

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