Demonstrates an issue related to comdats and IPO
One of the link orders (order-a on my machine) will have a
SIGFPE while the others won't. As far as I can tell, the program
is well defined, since in the original program both the places that
call maybe_divide store a non-zero value to ptr[0] before
calling it.
More details at http://lists.llvm.org/pipermail/llvm-dev/2016-February/095833.html.