[Fix] Fix the wrong check for tuple node in apache#18163 (apache#18170)

* [Fix] Fix the wrong check for tuple node in apache#18163

Author: cccxinli

src/relax/transform/fuse_ops.cc

@@ -427,17 +427,18 @@ class FunctionCreator : public ExprMutator {
           }
 
           for (const Expr& arg : call->args) {
-            if (GetStructInfoAs<TupleStructInfoNode>(arg) != nullptr) {
-              // The argument is fully referenced. Thus we remove it from the mapping.
-              partially_used_tuple_params_.erase(arg.get());
-              const Tuple& tup_args = Downcast<Tuple>(arg);
-              for (const Expr& tup_arg : tup_args->fields) {
+            if (auto tuple = arg.as<TupleNode>()) {
+              for (const Expr& tup_arg : tuple->fields) {
                 CheckDefAndUpdateParam(tup_arg);
                 ICHECK(GetStructInfoAs<TupleStructInfoNode>(tup_arg) == nullptr);
               }
             } else {
               CheckDefAndUpdateParam(arg);
             }
+            if (GetStructInfoAs<TupleStructInfoNode>(arg) != nullptr) {
+              // The argument is fully referenced. Thus we remove it from the mapping.
+              partially_used_tuple_params_.erase(arg.get());
+            }
           }
         }
       } else if (var_binding->value.as<TupleGetItemNode>()) {