[clang] [llvm] [RISCV] Add Zvzip intrinsics (PR #186342)

[Pengcheng Wang via cfe-commits]

wangpc-pp wrote:

> Looks like the clang codegen tests are failing, they don't seem to like LLVMOneNthElementsVectorType

Yes, I forgot that we need two intrinsic parameters in `RVVOutOp0BuiltinSet`. I have reverted that, masked and unmasked can't easily differ in the Clang side.

https://github.com/llvm/llvm-project/pull/186342