Add a utility function for bundling large input tensors (#37055)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/37055
Sometimes it's okay to bundle a large example input tensor with a model.
Add a utility function to make it easy for users to do that *on purpose*.
Test Plan: Unit test.
Differential Revision: D22264239
Pulled By: dreiss
fbshipit-source-id: 05c6422be1aa926cca850f994ff1ae83c0399119
