[clang] [llvm] [RISCV] Mark {vl, vtype} as clobber in inline assembly (PR #128636)

[Hank Chang via cfe-commits]

HankChang736 wrote:

I create another pull request [#130733](https://github.com/llvm/llvm-project/pull/130733) that is implemented with the RISCVInsertVSETVL approach, since it's a new approach.

https://github.com/llvm/llvm-project/pull/128636