[Forward-fix] check if source is None when using tensor out variants (p…

…ytorch#108700)

Summary: As title

Test Plan: Sandcastle

Reviewed By: JacobSzwejbka

Differential Revision: D49029357

Pull Request resolved: pytorch#108700
Approved by: https://github.com/angelayi

torch/_dynamo/variables/torch.py

@@ -756,7 +756,8 @@ def check_any_unspec(x):
                 elif isinstance(tensor_variable, TensorVariable):
                     assert isinstance(kwargs["out"], TensorVariable)
                     if (
-                        kwargs["out"] in tx.output.graphargs
+                        kwargs["out"].source
+                        and kwargs["out"] in tx.output.graphargs
                         and kwargs["out"].size != tensor_variable.size
                     ):
                         # It's hard to get out variants with resizing on graph inputs work