checker: fix comptime if branch checking

[felipensp]

Fix #15039

pub fn create<T>(val T) Value {
    $if T is bool {
		println('bool ${val}')
        return create_value_from_bool(val)
    }
    $else {
		$compile_error('11')
		println('not bool ${val}')
    }

	return Value(voidptr(0))
}

The code above was throwing $compile_error even when T is bool. This PR fixes such behavior.