niti: clear_caches: add collect_attr_propdef_cache.clear

Signed-off-by: Jean Privat <[email protected]>

src/interpreter/naive_interpreter.nit

@@ -117,6 +117,7 @@ class NaiveInterpreter
 	do
 		anchor_to_cache.clear
 		lookup_first_definition_cache.clear
+		collect_attr_propdef_cache.clear
 	end
 
 	# Subtype test in the context of the mainmodule