Description:
------------
The method ReflectionMethod::setAccessible doesn't change the accessibility of a private method defined in a trait.

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

trait Foo {
	
	private function foo() {}
}

class Bar {
	
	use Foo;
}

$bar = new Bar();
$method = new ReflectionMethod('Bar', 'foo');
$method->setAccessible(true);

$bar->foo();


Expected result:
----------------
The method foo should be callable.

Actual result:
--------------
PHP Fatal error:  Call to private method Bar::foo() from context '' in ...