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During `hlfir.assign` inlining and `ElementalAssignBufferization` we can deduce the optimal shape from `lhs` and `rhs` shapes. It is probably better be done in a separate pass that propagates constant shapes, but I have not seen any benchmarks that would benefit from this yet. So consider this as a workaround for a bigger TODO issue. The `ElementalAssignBufferization` case is from 465.tonto, but I do not have performance results yet (I do not expect much).