Add reflection test

The annotation is missing.

Author: nikic

ext/reflection/tests/constructor_promotion.phpt

@@ -0,0 +1,51 @@
+--TEST--
+Using Reflection on promoted properties
+--FILE--
+<?php
+
+class Test {
+    public function __construct(
+        public int $x,
+        /** @SomeAnnotation() */
+        public string $y = "123"
+    ) {}
+}
+
+$rc = new ReflectionClass(Test::class);
+echo $rc, "\n";
+
+$y = $rc->getProperty('y');
+var_dump($y->getDocComment());
+
+?>
+--EXPECTF--
+Class [ <user> class Test ] {
+  @@ %s 3-9
+
+  - Constants [0] {
+  }
+
+  - Static properties [0] {
+  }
+
+  - Static methods [0] {
+  }
+
+  - Properties [2] {
+    Property [ public int $x ]
+    Property [ public string $y ]
+  }
+
+  - Methods [1] {
+    Method [ <user, ctor> public method __construct ] {
+      @@ %s 4 - 8
+
+      - Parameters [2] {
+        Parameter #0 [ <required> int $x ]
+        Parameter #1 [ <optional> string $y = '123' ]
+      }
+    }
+  }
+}
+
+bool(false)