Subtensor lift: reason about advanced indices jointly when gating#2251
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We had heuristics that work per-axis, but we should reason about the advanced indices together since they interact. E.g., tril_indices, would fail the per-axis checks, as the index is larger than the axis and contains duplicates. But jointly they index less than the full array, so we want to lift it through Elemwise and the like.
Shows up in pymc-devs/pymc#8297