[VectorCombine] Add a mask for SK_Broadcast shuffle costing #85808
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This is part of a series of small patches to compute shuffle masks for the couple of cases where we call getShuffleCost without one. My goal is to add an invariant that all calls to getShuffleCost for fixed length vectors have a mask.
Note that this code appears to be reachable with scalable vectors, and thus we have to only pass a non-empty mask when the number of elements is precisely known.