[Bug target/123343] Loop unrolling before vectorization produces suboptimal RISC-V code

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123343

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Add `#pragma GCC unroll 0  ` to right before the inner most loop to see the
difference.