[Bug sanitizer/66908] Uninitialized variable when compiled with UBsan

[y.gribov at samsung dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66908

--- Comment #1 from Yury Gribov <y.gribov at samsung dot com> ---
Looks like -fsanitize=bounds may introduce uninitialized variables when run
after shift.