[clang] [clang][ThreadSafety] Instantiate a parameter's attribute naming a later parameter (PR #232784)

[Aaron Puchert via cfe-commits]

https://github.com/aaronpuchert commented:

It's a rather complex change, but conceptually I think it's solid. Maybe I can manage to have a more detailed look later, but you don't need to wait for that.

https://github.com/llvm/llvm-project/pull/232784