[llvm] [RISCV] Allow VCIX with SE to reorder (PR #77049)

[Craig Topper via llvm-commits]

topperc wrote:

> propose a dummy CSR called VCIX_STATE 

nit: it's not a CSR. CSR is a RISC-V term for register accessed by instructions like `csrrw`.

https://github.com/llvm/llvm-project/pull/77049