[llvm] [DebugInfo] Add clang flag to enable function-level debug line attribution (PR #93985)

[David Blaikie via llvm-commits]

dwblaikie wrote:

Anyone want to debate whether this should be "DW_AT_META" or "DW_AT_LLVM"? (mostly I think we've used LLVM for things that are usable within the LLVM ecosystem, which it seems the intent is that this might be - llvm-gsym, etc?) I guess the Apple accelerator tables were _APPLE_ but perhaps in part because they were only usable on with the MachO debug info distribution mechanism?

https://github.com/llvm/llvm-project/pull/93985