[Bug c/63803] When GCC 4.9.2 compile with option -O2, the target is error.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63803

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dereferencing a null pointer is undefined.
-fisolate-erroneous-paths-dereference changes some of them into __builtin_trap
and for arm that is udf #0.