Fix 32-bit env. model load issue (#20900)
Summary:
Fixed an issue where models can not be loaded in a 32-bit environment like Raspbian.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20900
Differential Revision: D15696709
Pulled By: ezyang
fbshipit-source-id: 37a81f05f235d3b9fc6244e12d3320ced3d1465e
