message: update to upstream API change
diff: @@ -1469,10 +1469,12 @@ lldb::TypeSystemSP SwiftASTContext::CreateInstance(lldb::LanguageType language,
  ArchSpec arch = module.GetArchitecture();
  ObjectFile *objfile = module.GetObjectFile();
  - ArchSpec object_arch;
  + if (!objfile)
  + return {};
  - if (!objfile || !objfile->GetArchitecture(object_arch))
  - return TypeSystemSP();
  + ArchSpec object_arch = objfile->GetArchitecture();
  + if (!object_arch.IsValid())
  + return {};
  lldb::CompUnitSP main_compile_unit_sp = module.GetCompileUnitAtIndex(0);
  