Merge branch 'PHP-7.4'

* PHP-7.4:
  Fixed bug #79820

Author: nikic

ext/reflection/tests/bug79820.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Bug #79820: Use after free when type duplicated into ReflectionProperty gets resolved
+--FILE--
+<?php
+
+class Test {
+    public stdClass $prop;
+}
+
+$rp = new ReflectionProperty(Test::class, 'prop');
+$test = new Test;
+$test->prop = new stdClass;
+var_dump($rp->getType()->getName());
+$test->dynProp = 42;
+
+$rp = new ReflectionProperty($test, 'dynProp');
+var_dump($rp->getType());
+
+?>
+--EXPECT--
+string(8) "stdClass"
+NULL