[clang] [llvm] [RISCV] Add Qualcomm uC Xqcia (Arithmetic) extension (PR #118113)

[Craig Topper via cfe-commits]

topperc wrote:

> LGTM.
> 
> 
> 
> I note Craig has questions about the spec, we will ensure those are relayed to the spec authors, but they don't relate to encoding/assembling problems, so I'm not sure if they should block landing this.

I don't consider my questions blocking. I just didn't know where else to ask.

https://github.com/llvm/llvm-project/pull/118113