Add test for bug #67215

bjori> writing a testcase making sure you get a fatal error and does not
segfault after that... is difficult

ext/opcache/tests/bug67215.phpt

@@ -0,0 +1,28 @@
+--TEST--
+Bug #67215 (php-cgi work with opcache, may be segmentation fault happen)
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+
+$file_c = __DIR__ . "/bug67215.c.php";
+$file_p = __DIR__ . "/bug67215.p.php";
+file_put_contents($file_c, "<?php require \"$file_p\"; class c extends p {} ?>");
+file_put_contents($file_p, '<?php class p { protected $var = ""; } ?>');
+require $file_c;
+$a = new c();
+require $file_c;
+?>
+--CLEAN--
+<?php
+$file_c = __DIR__ . "/bug67215.c.php";
+$file_p = __DIR__ . "/bug67215.p.php";
+unlink($file_c);
+unlink($file_p);
+?>
+--EXPECTF--
+Fatal error: Cannot redeclare class c in %sbug67215.c.php on line %d