Add tests for bugs #72793 and bugs #76874

These leaks have been resolved by the introduction of a proper
get_gc() implementation.

Author: nikic

ext/xml/tests/bug72793.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Bug #72793: xml_parser_free leaks mem when execute xml_set_object
+--FILE--
+<?php
+
+class xml  {
+    var $parser;
+
+    function __construct()
+    {
+        $this->parser = xml_parser_create();
+        xml_set_object($this->parser, $this);
+    }
+
+    function parse($data)
+    {
+        xml_parse($this->parser, $data);
+    }
+
+    function free(){
+        xml_parser_free($this->parser);
+    }
+}
+
+$xml_test = '<?xml version="1.0" encoding="utf-8"?><test></test>';
+$xml_parser = new xml();
+$xml_parser->parse($xml_test);
+$xml_parser->free();
+
+?>
+===DONE===
+--EXPECT--
+===DONE===

ext/xml/tests/bug76874.phpt

@@ -0,0 +1,29 @@
+--TEST--
+Bug #76874: xml_parser_free() should never leak memory
+--FILE--
+<?php
+
+class c
+{
+	private $xml;
+	private $test;
+
+	public function test()
+	{
+		$this->xml = xml_parser_create();
+		xml_set_character_data_handler($this->xml, array(&$this, 'handle_cdata'));
+		xml_parser_free($this->xml);
+	}
+
+	public function handle_cdata(&$parser, $data)
+	{
+	}
+}
+
+$object = new c();
+$object->test();
+
+?>
+===DONE===
+--EXPECT--
+===DONE===