add function to evaluate if we can push datas on node without add the size

src/datawizard/memory_manager.h

@@ -53,4 +53,7 @@ int _starpu_memory_manager_can_allocate_size(size_t size, unsigned node) STARPU_
  */
 void _starpu_memory_manager_deallocate_size(size_t size, unsigned node);
 
+
+int _starpu_memory_manager_test_allocate_size_(size_t size, unsigned node);
+
 #endif /* __MEMORY_MANAGER_H__ */