[llvm] [LLVM][DebugInfo] Allow ExtraData field to be a node reference (PR #165023)

[Vladislav Dzhidzhoev via llvm-commits]

dzhidzhoev wrote:

> We'll need to handle the verifier checks separately for different tags and also add constraints in this case, such as preventing nested tuples. If we decide to add those, we can include them in a separate follow-up PR.

That would be nice!

https://github.com/llvm/llvm-project/pull/165023