Update on "[dynamo] fix module buffers call"

This PR fixes module buffers call and extract module.buffers similar to
module.parameters

cc voznesenskym penguinwu anijain2305 EikanWang jgong5 Guobing-Chen XiaobingSuper zhuhaozhe blzheng Xia-Weiwen wenzhe-nrv jiayisunx

[ghstack-poisoned]

torch/_dynamo/variables/misc.py

@@ -637,20 +637,26 @@ def call_function(
                 value, mutable_local=MutableLocal(), **options
             )
         elif (
-            inspect.getmodule(self.value) is itertools
+            self.value is itertools.product
             and not kwargs
             and all(arg.has_unpack_var_sequence(tx) for arg in args)
         ):
             seqs = [arg.unpack_var_sequence(tx) for arg in args]
             items = []
-            if self.value is itertools.product:
-                for item in itertools.product(*seqs):
-                    items.append(variables.TupleVariable(list(item), **options))
-            elif self.value is itertools.chain:
-                for item in itertools.chain(*seqs):
-                    items.append(item)
-            else:
-                unimplemented(f"call_function {self.value} with {args}")
+            for item in itertools.product(*seqs):
+                items.append(variables.TupleVariable(list(item), **options))
+            return variables.ListIteratorVariable(
+                items, mutable_local=MutableLocal(), **options
+            )
+        elif (
+            self.value is itertools.chain
+            and not kwargs
+            and all(arg.has_unpack_var_sequence(tx) for arg in args)
+        ):
+            seqs = [arg.unpack_var_sequence(tx) for arg in args]
+            items = []
+            for item in itertools.chain(*seqs):
+                items.append(item)
             return variables.ListIteratorVariable(
                 items, mutable_local=MutableLocal(), **options
             )