message: [Swift] Update for frontend API change
diff: @@ -1374,7 +1374,7 @@ bool SwiftASTManipulator::AddExternalVariables(
  is_static, specifier, is_capture_list, loc, name, var_type,
  containing_function);
  redirected_var_decl->setInterfaceType(
  - containing_function->mapTypeOutOfContext(var_type));
  + var_type->mapTypeOutOfContext());
  redirected_var_decl->setDebuggerVar(true);
  redirected_var_decl->setImplicit(true);
  