[CodeCompletion] Fix attribute completion for var/let decl
[CodeCompletion] Fix attribute completion for var/let decl

There's no attribute declared for PatternBindingDecl. There are for
VarDecl. Code completion should consider DeclKind::PatternBinding as
DeclKind::Var.

xwu/swift,xwu/swift,gregomni/swift,parkera/swift,shahmishal/swift,JGiola/swift,ahoppen/swift,devincoughlin/swift,gregomni/swift,roambotics/swift,jckarter/swift,harlanhaskins/swift,rudkx/swift,benlangmuir/swift,karwa/swift,tkremenek/swift,jckarter/swift,hooman/swift,ahoppen/swift,jmgc/swift,xwu/swift,parkera/swift,jckarter/swift,jmgc/swift,tkremenek/swift,hooman/swift,sschiau/swift,apple/swift,rudkx/swift,rudkx/swift,gregomni/swift,hooman/swift,CodaFi/swift,allevato/swift,gregomni/swift,karwa/swift,nathawes/swift,sschiau/swift,sschiau/swift,ahoppen/swift,stephentyrone/swift,tkremenek/swift,roambotics/swift,airspeedswift/swift,jckarter/swift,gregomni/swift,harlanhaskins/swift,roambotics/swift,jmgc/swift,jckarter/swift,nathawes/swift,aschwaighofer/swift,karwa/swift,xedin/swift,atrick/swift,gribozavr/swift,jmgc/swift,sschiau/swift,airspeedswift/swift,apple/swift,aschwaighofer/swift,stephentyrone/swift,xwu/swift,tkremenek/swift,parkera/swift,allevato/swift,devincoughlin/swift,JGiola/swift,allevato/swift,nathawes/swift,gribozavr/swift,harlanhaskins/swift,hooman/swift,nathawes/swift,airspeedswift/swift,benlangmuir/swift,benlangmuir/swift,lorentey/swift,devincoughlin/swift,stephentyrone/swift,xedin/swift,glessard/swift,JGiola/swift,shahmishal/swift,allevato/swift,parkera/swift,rudkx/swift,CodaFi/swift,xwu/swift,sschiau/swift,harlanhaskins/swift,gribozavr/swift,CodaFi/swift,hooman/swift,roambotics/swift,devincoughlin/swift,allevato/swift,aschwaighofer/swift,airspeedswift/swift,parkera/swift,devincoughlin/swift,tkremenek/swift,ahoppen/swift,ahoppen/swift,roambotics/swift,parkera/swift,glessard/swift,lorentey/swift,parkera/swift,glessard/swift,CodaFi/swift,aschwaighofer/swift,airspeedswift/swift,hooman/swift,gribozavr/swift,CodaFi/swift,lorentey/swift,apple/swift,lorentey/swift,karwa/swift,harlanhaskins/swift,tkremenek/swift,devincoughlin/swift,shahmishal/swift,JGiola/swift,gribozavr/swift,lorentey/swift,allevato/swift,karwa/swift,nathawes/swift,rudkx/swift,parkera/swift,xedin/swift,jmgc/swift,xedin/swift,atrick/swift,stephentyrone/swift,benlangmuir/swift,jckarter/swift,glessard/swift,aschwaighofer/swift,atrick/swift,devincoughlin/swift,tkremenek/swift,karwa/swift,sschiau/swift,xedin/swift,gribozavr/swift,glessard/swift,stephentyrone/swift,sschiau/swift,xedin/swift,atrick/swift,airspeedswift/swift,CodaFi/swift,xedin/swift,devincoughlin/swift,aschwaighofer/swift,apple/swift,JGiola/swift,stephentyrone/swift,jckarter/swift,gregomni/swift,nathawes/swift,jmgc/swift,glessard/swift,gribozavr/swift,atrick/swift,airspeedswift/swift,stephentyrone/swift,aschwaighofer/swift,benlangmuir/swift,harlanhaskins/swift,benlangmuir/swift,xedin/swift,allevato/swift,karwa/swift,gribozavr/swift,JGiola/swift,CodaFi/swift,lorentey/swift,shahmishal/swift,ahoppen/swift,karwa/swift,sschiau/swift,shahmishal/swift,shahmishal/swift,shahmishal/swift,roambotics/swift,apple/swift,shahmishal/swift,xwu/swift,xwu/swift,lorentey/swift,harlanhaskins/swift,lorentey/swift,rudkx/swift,atrick/swift,nathawes/swift,jmgc/swift,apple/swift,hooman/swift