[llvm] [VP][RISCV] Add vp.cttz.elts intrinsic and its RISC-V codegen (PR #90502)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

> This intrinsic is basically ...

Is there anything that makes it `basically` the vp version and not just the vp version?

https://github.com/llvm/llvm-project/pull/90502