[Dispatch Creation] Improve horizontal fusion matching #22711
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Generalizes the lhs matching to handle arbitrary permutations, not just swaps. For example, the current algorithm cannot handle
affine_map<(d0, d1, d2, d3, d4, d5) -> (d0, d2, d3, d5)>toaffine_map<(d0, d1, d2, d3, d4, d5) -> (d0, d3, d4, d5)>because the first map does not containd4and the second does not containd2.This also fixes
applyPermutationToVectorto apply the inverse permutation to match the permutation applied to the indexing maps (map.compose(interchangeMap)). This used to work becauseperm = inv(perm)whenpermis just swapping pairs.Progress on #22631