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

[Mehdi Amini via llvm-commits]

joker-eph wrote:

This broke the bot: https://lab.llvm.org/buildbot/#/builders/272 ; is there already a fix or should we revert here?

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