[Analyzer] Forbid dynamic calls to scope introspection functions

[ovr]

https://wiki.php.net/rfc/forbid_dynamic_scope_introspection

For the functions

• extract()
• compact()
• get_defined_vars()
• parse_str() with one arg
• mb_parse_str() with one arg
• assert() with string argument (eval)
• func_get_args()
• func_get_arg()
• func_num_args()

dynamic calls of the form

• $fn()
• call_user_func($fn)
• array_map($fn, $array) etc.

will be forbidden. Such calls will result in a warning being thrown and an error-indicating return value being returned, that is consistent with other error-indicating return values of the respective functions.