pytorch

9041e29d - Revert D18209289: Moving python allgather_coalesced impl from Py to C

Revert D18209289: Moving python allgather_coalesced impl from Py to C Test Plan: revert-hammer Differential Revision: D18209289 Original commit changeset: c5a4c4a1aaa0 fbshipit-source-id: d4865e3f8c4eeee285c711e5c2250b8c9f9b0d25