[cmake/AddSwift] When `support` is passed for LLVM_LINK_COMPONENTS also implicitly include `demangle`
[cmake/AddSwift] When `support` is passed for LLVM_LINK_COMPONENTS also implicitly include `demangle`

Using `support` llvm component ends up adding `-Xlinker /path/to/lib/libLLVMDemangle.a`
to `LINK_FLAGS` but `libLLVMDemangle.a` is not added as an input to the linking ninja statement.
As a workaround, in order to setup precise inputs for the ninja link statement, include `demangle` component
whenever `support` is mentioned.

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