Add failing test for dangling pointer access

zend_observer_fcall_end_all accesses a dangling pointer when the execute_data was allocated on the stack.

Author: rioderelfte

ext/zend_test/tests/observer_bug81430_2.phpt

@@ -0,0 +1,32 @@
+--TEST--
+Bug #81430 (Attribute instantiation leaves dangling execute_data pointer)
+--INI--
+memory_limit=20M
+zend_test.observer.enabled=1
+zend_test.observer.observe_all=1
+--XFAIL--
+The stack allocated execute_data is invalid in zend_observer_fcall_end_all
+--FILE--
+<?php
+
+#[\Attribute]
+class A {
+        public function __construct() {
+                array_map("str_repeat", ["\xFF"], [100000000]); // cause a bailout
+        }
+}
+
+#[A]
+function B() {}
+
+$r = new \ReflectionFunction("B");
+call_user_func([$r->getAttributes(A::class)[0], 'newInstance']);
+--EXPECTF--
+<!-- init '%s' -->
+<file '%s'>
+  <!-- init A::__construct() -->
+  <A::__construct>
+
+Fatal error: Allowed memory size of 20971520 bytes exhausted %s in %s on line %d
+  </A::__construct>
+</file '%s'>