[llvm] [LLVM][DWARF] Add compilation directory and dwo name to TU in dwo section (PR #74909)

[David Blaikie via llvm-commits]

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

Works for me/at least worth using it to experiment, see if it works for lldb, etc.

Maybe a comment in the DwarfDebug source explaining what these attributes might be useful for?

https://github.com/llvm/llvm-project/pull/74909