pytorch

8398ebaa - Revert D28664514: [pytorch][PR] various TensorIterator speed improvements

Revert D28664514: [pytorch][PR] various TensorIterator speed improvements Test Plan: revert-hammer Differential Revision: D28664514 (https://github.com/pytorch/pytorch/commit/8a28bbeeb90454f4282e2186ccceb72f6a0e2a91) Original commit changeset: 2e03cf90b37a fbshipit-source-id: fcad039b7dc823fec8afa694ab74a7ac5011f8ab