pytorch

b7611724 - Revert D32786909: [C10D] [Easy] Use pinned memory for HtoD copies in Reducer:: sync_bucket_indices

Revert D32786909: [C10D] [Easy] Use pinned memory for HtoD copies in Reducer:: sync_bucket_indices Test Plan: revert-hammer Differential Revision: D32786909 (https://github.com/pytorch/pytorch/commit/dbc8d9c947dd9cf9527f92af4b1278c8bac245f7) Original commit changeset: a53f96f57e67 fbshipit-source-id: 19599c3a489804bfdbb3062f4256dceb680c143b