[RISCV] Use zext and shift for spread(4,8) when types allow (#118893) For a spread with an element type small enough, we can use a zext and shift to perform the shuffle. For e8, this covers spread(2,4,8), and for e16 covers spread(2,4). Note that spread(2) is already covered by the existing interleave logic, and is simply listed for completeness in the prior description.
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