[Bug target/69463] wrong code with -O1 and vector arithmetics @ x86_64

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69463

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
On trunk, this got fixed between r232939 (fails) and r232986 (OK). r232955
fixed PR69459, so this might be a duplicate.