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

[Bruno Cardoso Lopes via cfe-commits]

bcardosolopes wrote:

> Again though, a `FIXME: at one point we should capture macro expansions here so we can diagnose expansions more thoroughly` is perhaps not a bad addition here.

+1

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