[cmake] Add a comment describing what intrinsics_gen is and why swiftAST only depends on it when swift is not build standalone.
[cmake] Add a comment describing what intrinsics_gen is and why swiftAST only depends on it when swift is not build standalone.

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