Revert "[Dynamo] Fix inspect.getattr_static doesn't work well for torch.utils._cxx_pytree.PyTreeSpec (#120812)"

This reverts commit 1104e0798c8206e0226f2d68f6bb065645e6276f.

Reverted https://github.com/pytorch/pytorch/pull/120812 on behalf of https://github.com/huydhn due to Sorry for reverting your change but the XLA failure test_simple_model look legit https://hud.pytorch.org/pytorch/pytorch/commit/1104e0798c8206e0226f2d68f6bb065645e6276f ([comment](https://github.com/pytorch/pytorch/pull/120812#issuecomment-1972460001))
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_namedtuple b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_namedtuple
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_namedtuple
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec0 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec0
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec0
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec1 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec1
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec1
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec2 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec2
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec3 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec3
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec3
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec4 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec4
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec4
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec5 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec5
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec5
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec6 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec6
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec6
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec7 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec7
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec7
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec8 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec8
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec8
diff --git a/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec9 b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec9
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/test/dynamo_expected_failures/TestCxxPytree.test_pytree_serialize_spec9
diff --git a/torch/_dynamo/variables/user_defined.py b/torch/_dynamo/variables/user_defined.py
index ad96886..7dc97d7 100644
--- a/torch/_dynamo/variables/user_defined.py
+++ b/torch/_dynamo/variables/user_defined.py
@@ -697,9 +697,7 @@
 
     def _getattr_static(self, name):
         if (
-            isinstance(
-                self.value, (torch.nn.Module, torch.utils._cxx_pytree.PyTreeSpec)
-            )
+            isinstance(self.value, torch.nn.Module)
             or "__slots__" in self.value.__class__.__dict__
             or type(self.value) == threading.local
         ):