Re: [PATCH] RISC-V: Do not allow v0 as dest when merging [PR115068].

[Robin Dapp]

> I saw vwadd/vwsub.wx have same issue. Could you change them and add test too ?

Yes, will do.  At first I didn't manage to reproduce it because we
seem to be lacking a combine-opt pattern for it.  I'm going to post
it separately.

Regards
 Robin