message: Implement intrinsics assume and (un)likely
diff: @@ -298,6 +298,13 @@ pub fn codegen_call<'a, 'tcx: 'a>(
  "abort" => {
  fx.bcx.ins().trap(TrapCode::User(!0 - 1));
  }
  + "assume" => {
  + assert_eq!(args.len(), 1);
  + }
  + "likely" | "unlikely" => {
  + assert_eq!(args.len(), 1);
  + ret.write_cvalue(fx, args[0]);
  + }
  "copy" | "copy_nonoverlapping" => {
  let elem_ty = substs.type_at(0);
  let elem_size: u64 = fx.layout_of(elem_ty).size.bytes();
  