[llvm] [RISCV] Fix crash costing cttz.elts with zvl32b. (PR #226181)

[Florian Hahn via llvm-commits]

fhahn wrote:

> Returning invalid for a scalarized intrinsic is fine FWIW, but can you update the PR title/description to say "Fix crash costing cttz.elts with zvl32b"

Sure, updated thanks

https://github.com/llvm/llvm-project/pull/226181