pytorch

b8f509fd - Revert D20630949: Skip OpenMP thread when OMP_NUM_THREADS is set to 1

Revert D20630949: Skip OpenMP thread when OMP_NUM_THREADS is set to 1 Test Plan: revert-hammer Differential Revision: D20630949 Original commit changeset: 0b6f1ba5b535 fbshipit-source-id: a29c3e3a1b20441581009e16eaf4c893725be8d3