[AArch64][CostModel] Reduce cost of wider than legal get.active.lane.mask (#163786) getIntrinsicInstrCost should halve the cost returned by getTypeLegalizationCost when the return type requires splitting, but we know that the whilelo (predicate pair) instruction can be used. When splitting is still required, the cost get_active_lane_mask should also reflect the additional saturating add required to increment the start value.
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