[llvm] [RISCV] Add macro fusion support for the Xqci extension instructions (PR #209542)

[Pankaj Gode via llvm-commits]

pgodeq wrote:

Thanks for merging this, Sam. 
We would like this patch in our 23.x release, which is as close to upstream 23.x .

https://github.com/llvm/llvm-project/pull/209542