[Bug rtl-optimization/77541] [7 Regression] wrong code with 512bit vectors of int128 @ -O1

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77541

--- Comment #7 from Uroš Bizjak <ubizjak at gmail dot com> ---
The test needs

/* { dg-require-effective-target int128 } */

instead of

/* { dg-require-effective-target lp64 } */