[clang] [clang][analyzer] Model function addresses in constant initializers (PR #217608)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat commented:

Thanks for creating this patch!

I agree with its goals, but I didn't dig into a details to give an in-depth review because I see that @steakhal already gave a review and I don't think I could find more than him. 

https://github.com/llvm/llvm-project/pull/217608