[llvm] [RemoveDIs][DebugInfo][IR] Add parsing for non-intrinsic debug values (PR #79818)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

I've had to put aside testing for this patch for a short while, but I'll soon be uploading about a dozen small parsing tests for the various parsing errors that can occur in this patch; meanwhile, are there are any more questions or requested changes for the functional component for this patch, or is it good to land once the tests are available and approved?

https://github.com/llvm/llvm-project/pull/79818