Identify removed public/protected class constants

[asgrim]

PHP 7.2 only:
class A { public constant A = ''; }
class A { }

PHP 7.2 only:
class A { protected constant A = ''; }
class A { }

PHP 7.2 only, and NOT:
class A { private constant A = ''; }
class A { }

Any PHP version:
class A { constant A = ''; }
class A { }