Description:
------------
PHP interpreter stops with segmentation fault when it comes into recursive class constant definition.

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

class SomeConstants
{   
	const RECURSIVE_CONSTANT = self::RECURSIVE_CONSTANT;
}

Expected result:
----------------
It would be better if PHP interpreter stopped with helpful error message about recursive definition.

Actual result:
--------------
Nov 28 19:04:00 homestead kernel: [  194.868150] traps: php-fpm7.1[2753] general protection ip:565383b93854 sp:7fffcdf87b30 error:0 in php-fpm7.1[565383958000+3cf000]