[clang] [RISCV] Added definition of Ventana veyron-v1 processor. (PR #65535)

[Michael Maitland via cfe-commits]

michaelmaitland wrote:

> > I think you can drop the merge commit using `git rebase -i`. You may have to pass `--rebase-merges` to have the ability to drop the merge commit. Then you can pull upstream and `git rebase upstream/main`.
> 
> Thanks Michael, I tried but messed it up (I see more changes than I intended). Let me try again. If I mess it up again, is it OK if I just close this PR and start over?

I think you could drop [5fe9e82](https://github.com/llvm/llvm-project/pull/65535/commits/5fe9e82d849b85022a0a95016c65066dbae27e4d) using `git rebase -i`, recommit it, and then follow the LLVM GitHub User Guide on how to rebase on main. 

But if you want to close this PR and make another PR, thats fine by me.

https://github.com/llvm/llvm-project/pull/65535