Prepack folding for conv2d (#27119)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27119
att
Test Plan:
python test/test_jit.py 'TestJit.test_fold_prepack'
Imported from OSS
Differential Revision: D17717636
fbshipit-source-id: 97e9f8d927f7eacedf09f47b8ae1bf8216b8cad4
