[AST/ASTMangler] Fix linker error for `SWIFT_BUILD_ONLY_SYNTAXPARSERLIB` build
[AST/ASTMangler] Fix linker error for `SWIFT_BUILD_ONLY_SYNTAXPARSERLIB` build

With such a build we avoid linking the `clangAST` library.

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