Inserted check for PyObject_IsInstance in THPVariableCheck (#67588)
Summary:
Inserted check for the return of PyObject_IsInstance to capture the case in which it raises an exception and return -1. When this happen THPVariable_Check now throws a python_error to signal the exception.
Fixes https://github.com/pytorch/pytorch/issues/65084
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67588
Reviewed By: mruberry
Differential Revision: D32064776
Pulled By: albanD
fbshipit-source-id: 895c7682e0991ca257e27f9638a7462d83707320
