[llvm] [SelectionDAG] Fix null pointer dereference in resolveDanglingDebugInfo (PR #174341)

[Haoren Wang via llvm-commits]

MetalOxideSemi wrote:

Hi @adrian-prantl here is a fix to a null pointer dereference in resolveDanglingDebugInfo when handling aggregate constants with empty structs. Would appreciate your review when you have time since it is related to debug info handling. Thanks!

https://github.com/llvm/llvm-project/pull/174341