RemoveUnusedAliasRector removes aliases even though they are referenced in a class constant

[DieterHolvoet]

Bug Report

Subject	Details
Rector version	0.9.10
Installed as	prefixed Rector

RemoveUnusedAliasRector removes aliases even though they are referenced in a class constant.

Minimal PHP Code Causing Issue

<?php

namespace App;

use App\Bar as BarAlias;

class Foo
{
    private $classMap = [
        BarAlias::class => 'bar',
    ];
}

Expected Behaviour

The alias should not be removed.

[samsonasik]

After PR rectorphp/rector-src#784 , I think ClassConstFetch should be removed too if there is no conflict with use alias, it only make sense to have alias only if has conflict name in use statement.

I created a PR rectorphp/rector-src#785 for it.