[llvm] [llvm-dwarfdump] pretty-print DW_AT_call_origin reference (PR #71693)

[David Blaikie via llvm-commits]

https://github.com/dwblaikie approved this pull request.

Looks good to me.

I had a look around and couldn't find some existing code that already tests for whole DWARF attribute classes (like some kind of `isReference` function) - but maybe it's hiding somewhere, or would be nice to write one eventually.

https://github.com/llvm/llvm-project/pull/71693