Preloading: Fix handling of static vars in inherited methods

Part of bug #78512.

Author: nikic

ext/opcache/ZendAccelerator.c

@@ -4290,8 +4290,9 @@ static int accel_preload(const char *config)
 						if (op_array->static_variables) {
 							HashTable *ht = ZEND_MAP_PTR_GET(op_array->static_variables_ptr);
 							if (ht) {
-								ZEND_ASSERT(GC_REFCOUNT(ht) == 1);
-								zend_array_destroy(ht);
+								if (GC_DELREF(ht) == 0) {
+									zend_array_destroy(ht);
+								}
 								ZEND_MAP_PTR_SET(op_array->static_variables_ptr, NULL);
 							}
 						}

ext/opcache/tests/preload_bug78175_2.inc

@@ -15,6 +15,9 @@ class Loader {
 	}
 }
 
+class ExtLoader extends Loader {
+}
+
 Loader::getLoader();
 Loader::getCounter();
 Loader::getCounter();