[RISCV] Use per-SEW immediate inversion for vrol intrinsic patterns (#190113)
The VPatBinaryV_VI_VROL multiclass was using InvRot64Imm for all SEW
widths when converting vrol immediate intrinsics to vror.vi. This
produced unnecessarily large immediates for narrower element types
(e.g., 61 instead of 5 for SEW=8 rotate-left by 3).
Use the appropriate InvRot{SEW}Imm transform to match what the SDNode
patterns already do.
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>