Get a mask to interleave \p NumVec vectors into a wide vector. I.e. <0, VF, VF*2, ..., VF*(NumVec-1), 1, VF+1, VF*2+1, ...> E.g. For 2 interleaved vectors, if VF is 4, the mask is: <0, 4, 1, 5, 2, 6, 3, 7>
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