Add sensitive_parameter.phpt to PDO

This tests that sensitive parameters work correctly for methods, instead of
just global functions.

Author: TimWolla

ext/pdo/tests/sensitive_parameter.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Test that sensitive parameters are marked sensitive.
+--EXTENSIONS--
+pdo
+--FILE--
+<?php
+try {
+    new PDO('dsn', 'username', 'password');
+} catch (\Throwable $e) {
+    echo $e, PHP_EOL;
+}
+?>
+--EXPECTF--
+PDOException: PDO::__construct(): Argument #1 ($dsn) must be a valid data source name in %s:%d
+Stack trace:
+#0 %s(%d): PDO->__construct('dsn', 'username', Object(SensitiveParameterValue))
+#1 {main}