[llvm] [RISCV][NFC] Use !range bang operator (PR #66494)

[Joey Fernau via llvm-commits]

emtwelve wrote:

`!listconcat(!range(2, 8), !range(1, 2))` is more simple than `[ 2, 3, 4, 5, 6, 7, 1 ]`?

https://github.com/llvm/llvm-project/pull/66494