[Bug target/115725] RISC-V: Use wrong AVL for rv64gcv_zfh_zvl512b

[rdapp at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115725

--- Comment #11 from Robin Dapp <rdapp at gcc dot gnu.org> ---
> I believe it is VSETVL PASS doing the fusion, fuse all "vsetvl" according
> their
> demand field into a single "vsetvli" and put them since beginning.

Yes, and the vsetvl fusion is very useful here.