Add LONG_BINPUT to unpickler (#19696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19696
ghimport-source-id: 8d711cd3ed2b2810b5b3d765564429882f96d1f1
Differential Revision: D15072658
Pulled By: driazati
fbshipit-source-id: a28a90218874e07cfbed4f8df3d6d23ae5e70933
