[DAG][RISCV] Use vp.<binop> when widening illegal types for binops which can trap (#105214) This allows the use a single wider operation with a restricted EVL instead of having to split and cover via decreasing powers-of-two sizes. On RISCV, this avoids the need for a bunch of vslidedown and vslideup instructions to extract subvectors, and VL toggles to switch between the various widths. Note there is a potential downside of using vp nodes; we loose any generic DAG combines which might have applied to the split form.
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