Grandfather in torchgen'ed aten ops to torch.Tag.pt2_compliant_tag (#112053)

In torchgen, we add the pt2_compliant_tag to all aten ops.

Test Plan:
- new test
Pull Request resolved: https://github.com/pytorch/pytorch/pull/112053
Approved by: https://github.com/soulitzer

test/test_custom_ops.py

@@ -1693,6 +1693,10 @@ def forward(self, x_1):
         self.assertTrue(isinstance(actual, list))
         self.assertEqual(actual, list(tags))
 
+    def test_builtin_aten_ops_are_pt2_compliant(self):
+        for op in [torch.ops.aten.sin.default, torch.ops.aten.sum.dim_IntList]:
+            self.assertIn(torch.Tag.pt2_compliant_tag, op.tags)
+
     def test_define_bad_schema(self):
         lib = self.lib()
         with self.assertRaisesRegex(ValueError, "expected schema to look like"):

torchgen/model.py

@@ -649,6 +649,10 @@ class NativeFunction:
             tags_inp = [tags_inp]
         assert isinstance(tags_inp, list)
 
+        # All aten ops generated by torchgen receive the pt2_compliant tag.
+        if namespace == "aten" and "pt2_compliant_tag" in valid_tags:
+            tags_inp.append("pt2_compliant_tag")
+
         tags: Set[str] = set()
         for t in tags_inp:
             assert len(valid_tags) > 0