[Bug middle-end/109967] [11/12/13/14 Regression] Wrong code at -O2 on x86_64-linux-gnu

[shaohua.li at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109967

--- Comment #6 from Shaohua Li <shaohua.li at inf dot ethz.ch> ---
Bisected to r9-2635-g78ea9abc201