zend_lazy_object_get_properties() is used by zend_std_get_properties_ex() to fetch the properties of lazy objects. It initializes the object and returns its properties.
When initialization fails we return an empty ht because most callers do not check for NULL. We rely on the exception thrown during initialization. We also assign that empty ht to zend_object.properties for the same reasons.
We asserted that zend_object.properties was either NULL or &zend_empty_array, but there are other cases in which a uninitialized lazy object may have a properties ht.
Here I remove the assertion, and return the existing properties ht if there is one. Otherwise I return zend_new_array(0) instead of &zend_emtpy_array as not all callers expect an immutable array (e.g. FE_FETCH does not).
zend_get_property_info_for_slot(obj, slot) assumes that 'slot' belongs to 'obj', but that may not be the case for lazy proxies.
Fortunately, the property info is often already available in path when it is needed.
For other cases, I make zend_get_property_info_for_slot() aware of lazy objects, and add zend_get_property_info_for_slot_self() for cases where the 'slot' is known to belong to the object itself.
Fixes oss-fuzz #71446
