[pt] fuse ClipRangesGatherSigridHash (#49181)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49181
Fuse ClipRangesGatherSigridHash
Test Plan:
```
MKL_NUM_THREADS=1 OMP_NUM_THREADS=1 numactl -m 0 -C 3 ./buck-out/opt/gen/caffe2/caffe2/fb/predictor/ptvsc2_predictor_bench --scripted_model=/data/users/ansha/tmp/adindexer/merge/traced_merge_dper_fixes.pt --pt_inputs=/data/users/ansha/tmp/adindexer/merge/container_precomputation_bs1.pt --iters=30000 --warmup_iters=10000 --num_threads=1 --pred_net=/data/users/ansha/tmp/adindexer/precomputation_merge_net.pb --c2_inputs=/data/users/ansha/tmp/adindexer/merge/c2_inputs_precomputation_bs1.pb --c2_sigrid_transforms_opt=1 --c2_use_memonger=1 --c2_weights=/data/users/ansha/tmp/adindexer/merge/c2_weights_precomputation.pb --pt_enable_static_runtime --pt_cleanup_activations=true --pt_enable_out_variant=true --do_profile --compare_results
```
Verify op fused:
Node #3: 0.00104917 ms/iter, %173 : Tensor, %174 : Tensor = fb::clip_ranges_gather_sigrid_hash_offsets(%75, %76, %39, %40, %41, %38, %26)
Before: 0.0919786
After: 0.0911792
Reviewed By: hlu1
Differential Revision: D25468225
fbshipit-source-id: 36bd91c140eaa57cb42cdaad46d878b94f162a9d
