[clang] [SSAF] Let function parameters inherit linkage from their parent functions (PR #201946)

[Balázs Benics via cfe-commits]

https://github.com/steakhal approved this pull request.

You can merge this at will.
I still had an inline nit, but I'm also fine if you provide a justification there to discard that comment.

https://github.com/llvm/llvm-project/pull/201946