[gardening] Add a small header comment to SILGenBuilder.h describing the classes intent.
[gardening] Add a small header comment to SILGenBuilder.h describing the classes intent.

jopamer/swift,aschwaighofer/swift,JGiola/swift,airspeedswift/swift,stephentyrone/swift,glessard/swift,danielmartin/swift,amraboelela/swift,devincoughlin/swift,brentdax/swift,tjw/swift,huonw/swift,CodaFi/swift,ahoppen/swift,frootloops/swift,jmgc/swift,JGiola/swift,austinzheng/swift,tkremenek/swift,gregomni/swift,roambotics/swift,jckarter/swift,stephentyrone/swift,sschiau/swift,jopamer/swift,jmgc/swift,natecook1000/swift,uasys/swift,jmgc/swift,benlangmuir/swift,apple/swift,zisko/swift,swiftix/swift,JGiola/swift,benlangmuir/swift,OscarSwanros/swift,gribozavr/swift,parkera/swift,uasys/swift,huonw/swift,shajrawi/swift,amraboelela/swift,gribozavr/swift,frootloops/swift,gregomni/swift,alblue/swift,airspeedswift/swift,aschwaighofer/swift,apple/swift,stephentyrone/swift,rudkx/swift,shajrawi/swift,practicalswift/swift,xwu/swift,xwu/swift,ahoppen/swift,airspeedswift/swift,huonw/swift,lorentey/swift,nathawes/swift,tkremenek/swift,karwa/swift,alblue/swift,shahmishal/swift,glessard/swift,natecook1000/swift,amraboelela/swift,jopamer/swift,practicalswift/swift,hooman/swift,hooman/swift,tjw/swift,uasys/swift,amraboelela/swift,gregomni/swift,karwa/swift,ahoppen/swift,sschiau/swift,hooman/swift,xedin/swift,brentdax/swift,harlanhaskins/swift,roambotics/swift,ahoppen/swift,sschiau/swift,devincoughlin/swift,devincoughlin/swift,practicalswift/swift,karwa/swift,OscarSwanros/swift,danielmartin/swift,austinzheng/swift,atrick/swift,amraboelela/swift,shahmishal/swift,uasys/swift,xwu/swift,OscarSwanros/swift,harlanhaskins/swift,devincoughlin/swift,huonw/swift,jmgc/swift,gribozavr/swift,xedin/swift,apple/swift,rudkx/swift,lorentey/swift,jmgc/swift,aschwaighofer/swift,ahoppen/swift,gregomni/swift,devincoughlin/swift,swiftix/swift,harlanhaskins/swift,zisko/swift,jopamer/swift,xedin/swift,lorentey/swift,lorentey/swift,amraboelela/swift,rudkx/swift,nathawes/swift,natecook1000/swift,gribozavr/swift,atrick/swift,alblue/swift,rudkx/swift,frootloops/swift,roambotics/swift,nathawes/swift,uasys/swift,karwa/swift,frootloops/swift,uasys/swift,OscarSwanros/swift,glessard/swift,atrick/swift,jckarter/swift,CodaFi/swift,atrick/swift,tkremenek/swift,hooman/swift,sschiau/swift,natecook1000/swift,nathawes/swift,parkera/swift,benlangmuir/swift,zisko/swift,CodaFi/swift,lorentey/swift,allevato/swift,alblue/swift,roambotics/swift,airspeedswift/swift,ahoppen/swift,harlanhaskins/swift,karwa/swift,glessard/swift,xwu/swift,apple/swift,parkera/swift,xedin/swift,stephentyrone/swift,zisko/swift,xedin/swift,xwu/swift,parkera/swift,atrick/swift,apple/swift,OscarSwanros/swift,tjw/swift,lorentey/swift,CodaFi/swift,swiftix/swift,aschwaighofer/swift,karwa/swift,uasys/swift,glessard/swift,huonw/swift,gribozavr/swift,stephentyrone/swift,CodaFi/swift,zisko/swift,tkremenek/swift,JGiola/swift,sschiau/swift,jopamer/swift,practicalswift/swift,tjw/swift,nathawes/swift,sschiau/swift,amraboelela/swift,hooman/swift,parkera/swift,zisko/swift,allevato/swift,shahmishal/swift,devincoughlin/swift,tkremenek/swift,rudkx/swift,danielmartin/swift,parkera/swift,devincoughlin/swift,airspeedswift/swift,parkera/swift,tjw/swift,CodaFi/swift,devincoughlin/swift,shahmishal/swift,shajrawi/swift,jckarter/swift,brentdax/swift,shajrawi/swift,harlanhaskins/swift,apple/swift,brentdax/swift,tkremenek/swift,jckarter/swift,danielmartin/swift,natecook1000/swift,austinzheng/swift,jopamer/swift,benlangmuir/swift,hooman/swift,practicalswift/swift,huonw/swift,JGiola/swift,benlangmuir/swift,shajrawi/swift,practicalswift/swift,stephentyrone/swift,aschwaighofer/swift,atrick/swift,swiftix/swift,huonw/swift,xedin/swift,shajrawi/swift,austinzheng/swift,jopamer/swift,xwu/swift,danielmartin/swift,OscarSwanros/swift,natecook1000/swift,shahmishal/swift,jckarter/swift,jckarter/swift,roambotics/swift,lorentey/swift,gribozavr/swift,brentdax/swift,practicalswift/swift,frootloops/swift,tjw/swift,zisko/swift,jmgc/swift,sschiau/swift,jmgc/swift,gregomni/swift,swiftix/swift,gregomni/swift,allevato/swift,alblue/swift,JGiola/swift,danielmartin/swift,brentdax/swift,hooman/swift,shahmishal/swift,CodaFi/swift,danielmartin/swift,gribozavr/swift,brentdax/swift,allevato/swift,tjw/swift,gribozavr/swift,alblue/swift,shahmishal/swift,OscarSwanros/swift,lorentey/swift,xedin/swift,aschwaighofer/swift,benlangmuir/swift,airspeedswift/swift,roambotics/swift,swiftix/swift,frootloops/swift,harlanhaskins/swift,allevato/swift,austinzheng/swift,tkremenek/swift,austinzheng/swift,jckarter/swift,allevato/swift,alblue/swift,harlanhaskins/swift,karwa/swift,xedin/swift,natecook1000/swift,frootloops/swift,nathawes/swift,sschiau/swift,nathawes/swift,xwu/swift,shajrawi/swift,shahmishal/swift,austinzheng/swift,karwa/swift,swiftix/swift,stephentyrone/swift,rudkx/swift,airspeedswift/swift,allevato/swift,practicalswift/swift,aschwaighofer/swift,glessard/swift,shajrawi/swift,parkera/swift