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

Tue Jan 6 02:02:06 PST 2026

MetalOxideSemi wrote:

Hi, @arsenm @MacDue this PR is ready for merge when you have time. It fixes what we discussed in #173500 and #173947.  I managed to borrow a macOS device and it turned out to have nothing to do with host system. Targeting apple-darwin will always crash no matter which host it is running on, the failure of the previous PR is due to using default target (hence running on a macOS device causes it to targeting macOS and crash). XFAIL is added for further reproducing the DWARF on Darwin issues. 
Let me know if there's anything I should adjust. Thanks!

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