[clang] [llvm] [RISCV] Assembler support for XRivosVizip (PR #127694)

[Pengcheng Wang via cfe-commits]

wangpc-pp wrote:

I am kind of confused now. So the situation here is that RVIOS has already implemented these vendor extensions in cores and RVIOS is also trying to make these extensions official RVI standards, right?

https://github.com/llvm/llvm-project/pull/127694