[llvm] Add support for ref.func to AsmParser/MC (PR #163326)

[Derek Schuff via llvm-commits]

dschuff wrote:

I see. I guess the reason that nobody has implemented this before is that the more-common way to do this would be to just pass the index in the function table out to the embedder (i.e. the C function pointer) and then have the embedder do the equivalent of call_indirect rather than call_ref on it.

https://github.com/llvm/llvm-project/pull/163326