[Bug target/116086] RISC-V: Hash mismatch with vectorized 557.xz_r at zvl128b and LMUL=m2

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116086

--- Comment #7 from Robin Dapp <rdapp at gcc dot gnu.org> ---
Ok, if done right, i.e. without introducing a new bug, both the reduced case as
well as the original case show the same behavior with respect to the fix.
Also, xz calculates the proper hash, phew.

I sent a first version to the mailing list, let's see what the CI says.