https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67443
--- Comment #14 from Dominik Vogt <vogt at linux dot vnet.ibm.com> --- This is the thread discussing the patch that introduced the if-condition above to ao_ref_from_mem: https://gcc.gnu.org/ml/gcc-patches/2009-09/msg01638.html
