[Refactoring] Have addCustom take a SourceRange
[Refactoring] Have addCustom take a SourceRange

And have it automatically track to the end of the
token, as that's the behavior we seem to always
want.

ahoppen/swift,ahoppen/swift,hooman/swift,hooman/swift,benlangmuir/swift,parkera/swift,benlangmuir/swift,parkera/swift,apple/swift,JGiola/swift,hooman/swift,glessard/swift,glessard/swift,parkera/swift,JGiola/swift,apple/swift,parkera/swift,tkremenek/swift,hooman/swift,atrick/swift,tkremenek/swift,parkera/swift,parkera/swift,roambotics/swift,JGiola/swift,benlangmuir/swift,gregomni/swift,gregomni/swift,hooman/swift,glessard/swift,roambotics/swift,xwu/swift,rudkx/swift,atrick/swift,parkera/swift,benlangmuir/swift,atrick/swift,roambotics/swift,rudkx/swift,hooman/swift,roambotics/swift,apple/swift,tkremenek/swift,xwu/swift,atrick/swift,ahoppen/swift,ahoppen/swift,tkremenek/swift,JGiola/swift,benlangmuir/swift,tkremenek/swift,gregomni/swift,ahoppen/swift,xwu/swift,xwu/swift,rudkx/swift,rudkx/swift,rudkx/swift,gregomni/swift,parkera/swift,roambotics/swift,apple/swift,rudkx/swift,ahoppen/swift,benlangmuir/swift,tkremenek/swift,JGiola/swift,glessard/swift,xwu/swift,gregomni/swift,atrick/swift,roambotics/swift,hooman/swift,glessard/swift,tkremenek/swift,glessard/swift,xwu/swift,atrick/swift,JGiola/swift,apple/swift,xwu/swift,gregomni/swift,apple/swift