Introduce a verifier that ensures that the source range of an expression or statement covers the source ranges of its children. Encountered the bugs addressed in my previous commit.
Introduce a verifier that ensures that the source range of an expression or statement covers the source ranges of its children. Encountered the bugs addressed in my previous commit.

Swift SVN r862

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