[llvm] [DWARF][NFC] Support Roc Language (PR #225631)

[James Henderson via llvm-commits]

jh7370 wrote:

> There are unit-tests in LLVM that exercise the DW_LNAME_ APIs. Might want to check whether you can add a case there

The alternative would be to either write a test using assembly, or to leverage yaml2obj's DWARF support, if it extends far enough (I'm not confident it does, so the former is probably better).

Also, this is clearly not NFC if there are user-visible changes in behaviour.

https://github.com/llvm/llvm-project/pull/225631