Back out "Revert D17826873: Adding support to offsets based Fused8BitRowwiseEmbeddingLookup" (#27728)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27728
Original commit changeset: 15ad64e49f92
Test Plan: same as previous one.
Reviewed By: dreamingleo
Differential Revision: D17872553
fbshipit-source-id: fd9d180d5e02e2c17285898c79cdd9509ffb8bbf
