support default value in intlist (#6201)

* support default value in intlist

* fix comment

Co-authored-by: oneflow-ci-bot <69100618+oneflow-ci-bot@users.noreply.github.com>

tools/functional/generator.py

@@ -222,7 +222,14 @@ def __init__(self, fmt, keyword_only=False):
         sp = self._name.find("=")
         if sp != -1:
             self._default_value = _normalize(self._name[sp + 1 :])
-            if self._default_value == "None":
+            if self._type.endswith("List"):
+                _value_list = [
+                    self._default_value for i in range(self._size)
+                ]  # For int32List[2] = 1, _value_list will be [1, 1]
+                self._default_cpp_value = (
+                    "{" + ", ".join(_value_list) + "}"
+                )  # [1, 1] -> "{1, 1}"
+            elif self._default_value == "None":
                 self._optional = True
                 self._default_cpp_value = ""
             elif self._default_value in value_aliases: