Function rustc_codegen_ssa::common::build_langcall

pub fn build_langcall<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
    bx: &Bx,
    span: Option<Span>,
    li: LangItem
) -> (Bx::FnAbiOfResult, Bx::Value, Instance<'tcx>)