[Bug middle-end/66661] incorrect memory access in optimization with flexible array member

[P at draigBrady dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66661

--- Comment #4 from Pádraig Brady <P at draigBrady dot com> ---
I should note that I worked around the issue by increasing the allocation for
the structure on the heap up to a multiple of alignof(the_struct). See:
http://git.savannah.gnu.org/gitweb/?p=gnulib.git;a=commitdiff;h=49078a78