[clang] [CIR] Call code gen; create empty cir.func op (PR #113483)

[Shoaib Meenai via cfe-commits]

https://github.com/smeenai commented:

Very minor nits :)

Is it at all possible to write a test to exercise the new functionality, or will it just run into an NYI?

https://github.com/llvm/llvm-project/pull/113483