add test to verify clang 19+ -> tailcall vm

Author: henderkes

Zend/tests/vm_kind_tailcall_clang_windows.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Tailcall VM is selected when compiled with Clang >= 19 on Windows
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY !== 'Windows') die('skip Windows only');
+
+ob_start();
+phpinfo(INFO_GENERAL);
+$info = ob_get_clean();
+
+if (!preg_match('/Compiler => clang version (\d+)/', $info, $m)) {
+    die('skip not compiled with clang');
+}
+
+if ((int)$m[1] < 19) {
+    die('skip requires clang >= 19');
+}
+?>
+--FILE--
+<?php
+var_dump(ZEND_VM_KIND);
+?>
+--EXPECT--
+string(21) "ZEND_VM_KIND_TAILCALL"