Commits on Jan 29, 2021

1. Out variant for embedding_bag_4bit_rowwise_offsets (pytorch#51324) …

   Summary:
   Pull Request resolved: pytorch#51324
   
   Add out variant for embedding_bag_4bit_rowwise_offsets and add it to static runtime registry
   
   Test Plan:
   ```
   MKL_NUM_THREADS=1 OMP_NUM_THREADS=1 numactl -m 0 -C 1 buck-out/opt/gen/caffe2/caffe2/fb/predictor/ptvsc2_predictor_bench --scripted_model=$INLINE_CVR_DIR/210494966_0.predictor.disagg.remote_request_only_remote_cast.pt --pt_inputs=$INLINE_CVR_DIR/remote_ro_wrapped_input_data.pt --pt_enable_static_runtime=true --pt_cleanup_activations=true --pt_enable_out_variant=true --compare_results=true --iters=5000 --warmup_iters=5000 --num_threads=1 --do_profile=true
   ```
   
   before:
   ```
   0.789023 ms.    54.8408%. quantized::embedding_bag_4bit_rowwise_offsets (82 nodes)
   ```
   
   after:
   ```
   0.620817 ms.    49.7136%. quantized::embedding_bag_4bit_rowwise_offsets (82 nodes)
   ```
   
   Differential Revision: D26138322
   
   fbshipit-source-id: 0564ed4eaea702f6801f836364dde9419e71a5fb

   

   Marat Subkhankulov authored and facebook-github-bot committed Jan 29, 2021
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