[Bug libobjc/51891] class_copyIvarList crashes on empty ivars

[dpapavas at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51891

--- Comment #3 from Dimitris Papavasiliou <dpapavas at gmail dot com> ---
Created attachment 34329
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34329&action=edit
A patch that fixes the issue and provides a suitable testcase.