[clang] [clang][RISCV] Correct the SEW operand of indexed/fault only first segment intrinsics (PR #111476)

[Brandon Wu via cfe-commits]

4vtomat wrote:

> Make sense to me. It was wrong since when?

It's from the tuple interface change patches, https://github.com/llvm/llvm-project/pull/97992.

https://github.com/llvm/llvm-project/pull/111476