message: Disable line debuginfo for the AArch64 backend
diff: @@ -257,6 +257,10 @@ pub(crate) fn define(
  source_info_set: &indexmap::IndexSet<SourceInfo>,
  local_map: FxHashMap<mir::Local, CPlace<'tcx>>,
  ) {
  + if isa.get_mach_backend().is_some() {
  + return; // The AArch64 backend doesn't support line debuginfo yet.
  + }
  +
  let end = self.create_debug_lines(context, isa, source_info_set);
  self.debug_context
  