[Bug target/91635] wrong code at -O2 with __builtin_add_overflow() and shifts

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91635

--- Comment #9 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 46801
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46801&action=edit
another testcase