Function build_session 

pub fn build_session(
    sopts: Options,
    io: CompilerIO,
    fluent_bundle: Option<Arc<FluentBundle>>,
    registry: Registry,
    fluent_resources: Vec<&'static str>,
    driver_lint_caps: FxHashMap<LintId, Level>,
    target: Target,
    cfg_version: &'static str,
    ice_file: Option<PathBuf>,
    using_internal_features: &'static AtomicBool,
) -> Session