Infinite recursion in NodeExpressionResolver::resolveExprClassConstFetch()

[VolCh]

During investigate #83 I found that a snippet like

<?php

class GlobalNamespaceClass
{
    const LITERAL = 1;
    const RELATIVE = GlobalNamespaceClass::LITERAL;
}

causes a infinite recursion in NodeExpressionResolver::resolveExprClassConstFetch()

I can't found way to simple fix it.