[utils/line-directive] add reverse mapping
[utils/line-directive] add reverse mapping

This will be useful for tooling involving gyb files.

tkremenek/swift,parkera/swift,gribozavr/swift,stephentyrone/swift,nathawes/swift,stephentyrone/swift,alblue/swift,gribozavr/swift,gmilos/swift,JGiola/swift,uasys/swift,gottesmm/swift,harlanhaskins/swift,uasys/swift,jtbandes/swift,modocache/swift,danielmartin/swift,nathawes/swift,jckarter/swift,gmilos/swift,frootloops/swift,danielmartin/swift,xwu/swift,tinysun212/swift-windows,codestergit/swift,brentdax/swift,jmgc/swift,lorentey/swift,jtbandes/swift,airspeedswift/swift,natecook1000/swift,natecook1000/swift,milseman/swift,ben-ng/swift,gribozavr/swift,jckarter/swift,shahmishal/swift,practicalswift/swift,tinysun212/swift-windows,CodaFi/swift,JaSpa/swift,brentdax/swift,atrick/swift,ahoppen/swift,tardieu/swift,stephentyrone/swift,shahmishal/swift,karwa/swift,CodaFi/swift,bitjammer/swift,ahoppen/swift,tjw/swift,jopamer/swift,JaSpa/swift,roambotics/swift,parkera/swift,gottesmm/swift,gottesmm/swift,djwbrown/swift,gribozavr/swift,kperryua/swift,return/swift,shajrawi/swift,harlanhaskins/swift,deyton/swift,roambotics/swift,alblue/swift,karwa/swift,practicalswift/swift,modocache/swift,rudkx/swift,jtbandes/swift,zisko/swift,OscarSwanros/swift,benlangmuir/swift,gribozavr/swift,amraboelela/swift,bitjammer/swift,ben-ng/swift,stephentyrone/swift,kperryua/swift,lorentey/swift,airspeedswift/swift,tkremenek/swift,OscarSwanros/swift,IngmarStein/swift,arvedviehweger/swift,jckarter/swift,OscarSwanros/swift,huonw/swift,sschiau/swift,rudkx/swift,amraboelela/swift,swiftix/swift,manavgabhawala/swift,sschiau/swift,lorentey/swift,frootloops/swift,milseman/swift,atrick/swift,return/swift,brentdax/swift,xedin/swift,harlanhaskins/swift,austinzheng/swift,atrick/swift,shajrawi/swift,kstaring/swift,ben-ng/swift,jtbandes/swift,IngmarStein/swift,jckarter/swift,shajrawi/swift,gmilos/swift,shajrawi/swift,codestergit/swift,practicalswift/swift,kperryua/swift,kperryua/swift,huonw/swift,tjw/swift,djwbrown/swift,devincoughlin/swift,shajrawi/swift,IngmarStein/swift,therealbnut/swift,IngmarStein/swift,zisko/swift,return/swift,hughbe/swift,harlanhaskins/swift,frootloops/swift,gmilos/swift,austinzheng/swift,uasys/swift,sschiau/swift,lorentey/swift,JGiola/swift,xwu/swift,rudkx/swift,glessard/swift,Jnosh/swift,gregomni/swift,codestergit/swift,hughbe/swift,austinzheng/swift,aschwaighofer/swift,deyton/swift,apple/swift,tardieu/swift,djwbrown/swift,jopamer/swift,gmilos/swift,atrick/swift,Jnosh/swift,felix91gr/swift,jmgc/swift,benlangmuir/swift,aschwaighofer/swift,tardieu/swift,CodaFi/swift,tjw/swift,ben-ng/swift,alblue/swift,jopamer/swift,felix91gr/swift,return/swift,xwu/swift,Jnosh/swift,nathawes/swift,JaSpa/swift,gregomni/swift,zisko/swift,felix91gr/swift,practicalswift/swift,tardieu/swift,JaSpa/swift,felix91gr/swift,djwbrown/swift,swiftix/swift,jtbandes/swift,karwa/swift,calebd/swift,devincoughlin/swift,calebd/swift,apple/swift,OscarSwanros/swift,djwbrown/swift,codestergit/swift,hooman/swift,gribozavr/swift,zisko/swift,ben-ng/swift,CodaFi/swift,shahmishal/swift,xedin/swift,danielmartin/swift,devincoughlin/swift,codestergit/swift,hooman/swift,kstaring/swift,nathawes/swift,jopamer/swift,natecook1000/swift,therealbnut/swift,swiftix/swift,natecook1000/swift,gregomni/swift,lorentey/swift,modocache/swift,milseman/swift,gottesmm/swift,aschwaighofer/swift,zisko/swift,huonw/swift,xedin/swift,alblue/swift,aschwaighofer/swift,glessard/swift,kstaring/swift,airspeedswift/swift,sschiau/swift,kstaring/swift,tjw/swift,hooman/swift,deyton/swift,OscarSwanros/swift,gregomni/swift,natecook1000/swift,brentdax/swift,jckarter/swift,deyton/swift,shahmishal/swift,roambotics/swift,allevato/swift,bitjammer/swift,nathawes/swift,tkremenek/swift,parkera/swift,felix91gr/swift,huonw/swift,huonw/swift,JaSpa/swift,sschiau/swift,ben-ng/swift,allevato/swift,allevato/swift,huonw/swift,atrick/swift,JGiola/swift,gribozavr/swift,gottesmm/swift,devincoughlin/swift,amraboelela/swift,shahmishal/swift,shahmishal/swift,glessard/swift,austinzheng/swift,aschwaighofer/swift,parkera/swift,CodaFi/swift,aschwaighofer/swift,hughbe/swift,tkremenek/swift,IngmarStein/swift,apple/swift,parkera/swift,kstaring/swift,alblue/swift,karwa/swift,arvedviehweger/swift,Jnosh/swift,tinysun212/swift-windows,manavgabhawala/swift,gmilos/swift,swiftix/swift,stephentyrone/swift,amraboelela/swift,glessard/swift,therealbnut/swift,stephentyrone/swift,milseman/swift,uasys/swift,Jnosh/swift,felix91gr/swift,swiftix/swift,modocache/swift,swiftix/swift,airspeedswift/swift,tjw/swift,codestergit/swift,djwbrown/swift,practicalswift/swift,deyton/swift,therealbnut/swift,OscarSwanros/swift,allevato/swift,sschiau/swift,tardieu/swift,karwa/swift,karwa/swift,swiftix/swift,Jnosh/swift,zisko/swift,xwu/swift,frootloops/swift,calebd/swift,hooman/swift,xedin/swift,airspeedswift/swift,shajrawi/swift,jmgc/swift,alblue/swift,harlanhaskins/swift,modocache/swift,ahoppen/swift,felix91gr/swift,apple/swift,calebd/swift,xedin/swift,arvedviehweger/swift,JGiola/swift,manavgabhawala/swift,manavgabhawala/swift,jckarter/swift,benlangmuir/swift,lorentey/swift,shahmishal/swift,shajrawi/swift,xedin/swift,uasys/swift,Jnosh/swift,manavgabhawala/swift,parkera/swift,gregomni/swift,uasys/swift,glessard/swift,jckarter/swift,tardieu/swift,hughbe/swift,devincoughlin/swift,tkremenek/swift,xwu/swift,hughbe/swift,lorentey/swift,brentdax/swift,kperryua/swift,natecook1000/swift,allevato/swift,CodaFi/swift,tinysun212/swift-windows,tardieu/swift,nathawes/swift,frootloops/swift,huonw/swift,codestergit/swift,jtbandes/swift,apple/swift,benlangmuir/swift,calebd/swift,bitjammer/swift,benlangmuir/swift,zisko/swift,modocache/swift,gmilos/swift,nathawes/swift,practicalswift/swift,djwbrown/swift,IngmarStein/swift,devincoughlin/swift,sschiau/swift,austinzheng/swift,harlanhaskins/swift,tinysun212/swift-windows,deyton/swift,amraboelela/swift,devincoughlin/swift,tinysun212/swift-windows,tjw/swift,bitjammer/swift,therealbnut/swift,jmgc/swift,arvedviehweger/swift,ahoppen/swift,bitjammer/swift,xwu/swift,roambotics/swift,sschiau/swift,tkremenek/swift,stephentyrone/swift,JGiola/swift,xedin/swift,devincoughlin/swift,allevato/swift,arvedviehweger/swift,return/swift,hooman/swift,karwa/swift,manavgabhawala/swift,JaSpa/swift,frootloops/swift,JGiola/swift,jmgc/swift,IngmarStein/swift,aschwaighofer/swift,modocache/swift,therealbnut/swift,hooman/swift,jmgc/swift,ahoppen/swift,xedin/swift,OscarSwanros/swift,airspeedswift/swift,jopamer/swift,rudkx/swift,gottesmm/swift,austinzheng/swift,xwu/swift,hughbe/swift,milseman/swift,natecook1000/swift,practicalswift/swift,airspeedswift/swift,ben-ng/swift,therealbnut/swift,manavgabhawala/swift,kperryua/swift,CodaFi/swift,JaSpa/swift,return/swift,jtbandes/swift,atrick/swift,harlanhaskins/swift,brentdax/swift,benlangmuir/swift,kperryua/swift,gregomni/swift,ahoppen/swift,danielmartin/swift,kstaring/swift,roambotics/swift,alblue/swift,shahmishal/swift,danielmartin/swift,jopamer/swift,allevato/swift,practicalswift/swift,parkera/swift,amraboelela/swift,gottesmm/swift,roambotics/swift,tjw/swift,hooman/swift,deyton/swift,shajrawi/swift,uasys/swift,glessard/swift,jmgc/swift,calebd/swift,lorentey/swift,jopamer/swift,arvedviehweger/swift,gribozavr/swift,austinzheng/swift,apple/swift,milseman/swift,bitjammer/swift,danielmartin/swift,amraboelela/swift,return/swift,tinysun212/swift-windows,hughbe/swift,brentdax/swift,rudkx/swift,milseman/swift,tkremenek/swift,danielmartin/swift,frootloops/swift,parkera/swift,calebd/swift,karwa/swift,rudkx/swift,kstaring/swift,arvedviehweger/swift