fn spawn_thin_lto_work<'a, B: ExtraBackendMethods>(
cgcx: &'a CodegenContext<B>,
coordinator_send: Sender<ThinLtoMessage>,
work: ThinLtoWorkItem<B>,
)fn spawn_thin_lto_work<'a, B: ExtraBackendMethods>(
cgcx: &'a CodegenContext<B>,
coordinator_send: Sender<ThinLtoMessage>,
work: ThinLtoWorkItem<B>,
)