[Bug middle-end/60546] [4.8/4.9] O2 & asan enable generates wrong insns

[manjian2006 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60546

--- Comment #12 from linzj <manjian2006 at gmail dot com> ---
Alright,should I change the algorithm to avoid this bug?