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

[Pankaj Gode via llvm-commits]

pgodeq wrote:

My commit rights were revoked recently, so if @wangpc-pp or @lenary find this good, could you please merge this ? 

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