[php-src] Issue #8959: `static $var = xxx` should support any expression

Issue: https://github.com/php/php-src/issues/8959 Author: mvorisek ### Description https://3v4l.org/hsMgb ``` <?php class Cl { public function scalar(): void { static $counter = 0; } public function obj(): void { static $counter = new class() {}; } } ``` Currently php emits fatal error for static $var = new class() {};. But static $var = ...; should support any expression like if the assign op would not be prefixed with static as such prefix only defines the statement should be evaluated only once per php request lifecycle.