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3bd82f30dc
This adds the hint to a number of tensor allocations in codegens, shaving off quite some time from e.g. reading in sparse matrices due to zero-reallocation scheme. Note that we can probably provide hints on all allocations, and refine the heuristics that use them for general tensors. Reviewed By: bixia Differential Revision: https://reviews.llvm.org/D143309