[llvm] [llvm/DWARF] Recursively resolve DW_AT_signature references (PR #97423)

[David Blaikie via llvm-commits]

https://github.com/dwblaikie commented:

Love the change - thanks for this! (& putting it into LLVM with the intent to match future changes to LLDB is excellent - will help with the type printer generalization work I've got going that's trying to port the type printer to work with LLDB too, which I'd just commented out/punted on the type unit support for now - and with this patch it should come out in the wash (after resolving these changes against my own)

https://github.com/llvm/llvm-project/pull/97423