Merge branch 'PHP-7.4'

* PHP-7.4:
  Fix #79919: Stack use-after-scope in define()

Author: cmb69

Zend/tests/bug79919.phpt

@@ -0,0 +1,14 @@
+--TEST--
+Bug #79919 (Stack use-after-scope in define())
+--SKIPIF--
+<?php
+if (!extension_loaded('simplexml')) die('skip simplexml extension not available');
+?>
+--FILE--
+<?php
+$b = error_log(0);
+$b = simplexml_load_string('<xml/>', null, $b);
+define(0, $b);
+?>
+--EXPECT--
+0