[llvm] [RISCV][XCV] Add LLVM intrinsics for non-representable XCVsimd ops (PR #204880)

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

Was an LLM used to assist in this PR? It's fine to use one, but just a heads up if you are it should be declared per the LLVM AI policy: https://llvm.org/docs/AIToolPolicy.html

https://github.com/llvm/llvm-project/pull/204880