Add entropy when observer extension enabled

Author: SammyK

Zend/zend_observer.c

@@ -39,7 +39,7 @@ ZEND_API void zend_observer_fcall_register(zend_observer_fcall_init init) {
 	/* We don't want to get an extension handle unless an ext installs an observer */
 	if (!ZEND_OBSERVER_ENABLED) {
 		zend_observer_fcall_op_array_extension =
-			zend_get_op_array_extension_handle();
+			zend_get_op_array_extension_handle("Zend Observer");
 
 		/* ZEND_CALL_TRAMPOLINE has SPEC(OBSERVER) but zend_init_call_trampoline_op()
 		 * is called before any extensions have registered as an observer. So we