[Bug c/110683] wrong code with '-O2' and specific optimizations

[19373742 at buaa dot edu.cn via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110683

--- Comment #2 from CTC <19373742 at buaa dot edu.cn> ---
The reduced optimizations is -O2 -fpack-struct