[RISCV] Emit VP strided load in mgather combine. NFCI (#98112) This combine is a duplication of the transform in RISCVGatherScatterLowering but at the SelectionDAG level, so similarly to #98111 we can replace the use of riscv_masked_strided_load with a VP strided load. Unlike #98111 we don't require #97800 or #97798 since it only operates on fixed vectors with a non-zero stride.
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