isset/empty wrongly considered as callable #6014
Description
Bug report
empty() and isset() are considered as callable by PHPStan while they're not.
Code snippet that reproduces the problem
<?php
var_dump(is_callable('empty')); // bool(false)
var_dump(is_callable('isset')); // bool(false)https://phpstan.org/r/c8e58374-a244-41c8-927c-1905a945389e
Call to function is_callable() with 'empty' will always evaluate to true.
Call to function is_callable() with 'isset' will always evaluate to true.
Expected output
Call to function is_callable() with 'empty' will always evaluate to false.
Call to function is_callable() with 'isset' will always evaluate to false.
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