Description:
------------
When getting the string value of a ReflectionType instance that represents a class name, 7.1.0beta3 seems to prefix the value with a namespace separator.

This behavior is inconsistent with the treatment of runtime class names across all other PHP functions, such as get_class(), that do not use a namespace separator prefix.

It is also a regression. 7.1.0_beta1 did not exhibit this issue (not sure about beta 2). 

Test script:
---------------
<?php

$f = function (stdClass $a) {};
$r = new ReflectionFunction($f);
$p = $r->getParameters();
$t = $p[0]->getType();

echo $t;


Expected result:
----------------
stdClass

Actual result:
--------------
\stdClass