[Refactoring] BitwiseBaseOperator - up code quality
[Refactoring] BitwiseBaseOperator - up code quality

- Method optimizeConstantFolding can return boolean or CompiledExpression and we can check without uneeded switch and is_object

zephir-lang/zephir,vpg/zephir,phalcon/zephir,sergeyklay/zephir,dreamsxin/zephir,phalcon/zephir,steffengy/zephir,sjinks/zephir,sjinks/zephir,sergeyklay/zephir,vpg/zephir,steffengy/zephir,zephir-lang/zephir,phalcon/zephir,dreamsxin/zephir,dreamsxin/zephir,vpg/zephir,phalcon/zephir,sergeyklay/zephir,zephir-lang/zephir,steffengy/zephir,sjinks/zephir,zephir-lang/zephir,vpg/zephir,steffengy/zephir,sergeyklay/zephir,dreamsxin/zephir,dreamsxin/zephir,sjinks/zephir,sergeyklay/zephir,sjinks/zephir,dreamsxin/zephir,vpg/zephir,zephir-lang/zephir,sjinks/zephir,steffengy/zephir,steffengy/zephir,vpg/zephir,phalcon/zephir,sergeyklay/zephir,phalcon/zephir