[Php70] Handle crash on IfToSpaceshipRector with enum case

[samsonasik]

Given the following code:

enum Status {
    case Foo;
    case Bar;
}

final class Service {
    public function status(int $param): Status {
        /**
         * These pass:
         *
         * - if ($param)
         * - if (true)
         */
        if ($param === 1) {
            return Status::Foo;
        }

        return Status::Bar;
    }
}

It produce crash:

There was 1 error:

1) Rector\Tests\Php70\Rector\If_\IfToSpaceshipRector\IfToSpaceshipRectorTest::test with data set #2 ('/Users/samsonasik/www/rector-...hp.inc')
LogicException: This enum case does not have a value

phar:///Users/samsonasik/www/rector-src/vendor/phpstan/phpstan/phpstan.phar/vendor/ondrejmirtes/better-reflection/src/Reflection/ReflectionEnumCase.php:99
phar:///Users/samsonasik/www/rector-src/vendor/phpstan/phpstan/phpstan.phar/vendor/ondrejmirtes/better-reflection/src/Reflection/Adapter/ReflectionClassConstant.php:64
phar:///Users/samsonasik/www/rector-src/vendor/phpstan/phpstan/phpstan.phar/src/Reflection/ClassConstantReflection.php:78
/Users/samsonasik/www/rector-src/src/PhpParser/Node/Value/ValueResolver.php:300
/Users/samsonasik/www/rector-src/src/PhpParser/Node/Value/ValueResolver.php:191

This PR try to fix it. Fixes rectorphp/rector#7737 Fixes rectorphp/rector#7736

[samsonasik]

Fixed 🎉 /cc @mpesari

[samsonasik]

this should also fix rectorphp/rector#7736

[samsonasik]

All checks have passed 🎉 @TomasVotruba it is ready for review.

[TomasVotruba]

Thank you 👍

[mpesari]

Thanks!