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e2b365948b
LinalgOps that are all parallel do not use the value of `outs` tensor. The semantics is that the `outs` tensor is fully overwritten. Using anything other than `init_tensor` can add false dependencies between operations, when the use is just for the shape of the tensor. Adding a canonicalization to always use `init_tensor` in such cases, breaks this dependence. Differential Revision: https://reviews.llvm.org/D102561