[clang] [FMV] Emit the resolver along with the default version definition. (PR #84405)

[Alexandros Lamprineas via cfe-commits]

labrinea wrote:

I have raised two related pull requests stacked on this one:
- https://github.com/labrinea/llvm-project/pull/1
- https://github.com/labrinea/llvm-project/pull/2

Is there anything else we would like to address in this patch?

https://github.com/llvm/llvm-project/pull/84405