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#sdy Add an event to the op priority schedule to propagate through all ops after element-wise ops, but **only** through non-passthrough factors. #384

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#sdy Add an event to the op priority schedule to propagate through all ops after element-wise ops, but only through non-passthrough factors.

In the test case added pass_through_factor_higher_priority_than_reduction_factor, before we'd shard %arg0 to [{?}, {"a", ?}] due to sideways propagation on the reduction factor. But now we halt that while we propagate through the non-contracting dim backwards from the result to get [{"a", ?}, {?}].

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