[llvm] [NVPTX] Fix for LTO dwarf emission when multiple CUs with a mix of DebugDirectivesOnly and NoDebug (PR #190371)

[Eric Christopher via llvm-commits]

echristo wrote:

Going to squash and merge this - if you can get the follow-ons I'd appreciate.

https://github.com/llvm/llvm-project/pull/190371