Don't use type_is_gc... type_is_gc expects a PyTypeObject, which is not what will get passed to it if we pass it to the tp_is_gc fields of static_data_object

[SVN r57590]

libs/python

@@ -1 +1 @@
-Subproject commit 8b0655ce94b011a4c2269449d90090bf842dbb16
+Subproject commit 338732793a0091f68a12a12032935f1d7424548b