#138117 by gordon. Invoke hook_user('login') on registrations without email verification.

modules/user/user.module

@@ -1263,6 +1263,8 @@ function user_register_submit($form_id, $form_values) {
       $body = _user_mail_text('welcome_body', $variables);
       drupal_mail('user-register-welcome', $mail, $subject, $body, $from);
       user_authenticate($account->name, trim($pass));
+      $edit = array();
+      user_module_invoke('login', $edit, $account);
       return '';
     }
     else if ($account->status || $notify) {