[llvm] [RISCV] Add Xqci Insn Formats (PR #132986)

[Sam Elliott via llvm-commits]

lenary wrote:

> @lenary I've reverted this PR with [68fb7a5](https://github.com/llvm/llvm-project/commit/68fb7a5a1d203dde7badf67031bdd9eb650eef5d). I'm happy to try your revised version. Thanks!

Thanks for getting that. I'll reopen a PR with the fix.

https://github.com/llvm/llvm-project/pull/132986