[Bug target/121910] RISC-V: dynamic lmul choosing wrong vector mode

[chenzhongyao.hit at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121910

--- Comment #7 from Zhongyao Chen <chenzhongyao.hit at gmail dot com> ---
(In reply to JuzheZhong from comment #6)
> The changes look good to me. Could you try the GCC testsuite testing with
> your change ? It looks reasonable to return maximum LMUL (RVV_M8) instead of
> regno_alignment.

testsuite passed.