[PATCH] RISC-V: Implement autovec abs, vneg, vnot.

[Robin Dapp]

> So I expect you will also apply those refactor on Juzhe's new changes?
> If so I would like to have a separated NFC refactor patch if possible.

What's NFC? :)  Do you mean to just have the refactor part as a separate
patch?  If yes, I agree.

> e.g.
> Juzhe's vec_cmp/vcond -> NFC refactor patch -> abs, vneg, vnot