Better error message for tensor with grad as constant in tracing (#18298)
Summary:
Fix for https://github.com/pytorch/pytorch/issues/17583
There's an unrelated issue right now causing a segfault when printing tensor so that might have to fixed first for this to land
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18298
Differential Revision: D14584266
Pulled By: eellison
fbshipit-source-id: 4e7850dadc78ef1e98ad40b9d8adc0fef42acf48
