message: Fix miscompilation in previous commit
diff: @@ -701,19 +701,22 @@ fn is_fat_ptr<'tcx>(
  fx.bcx.call_memset(fx.cx.module.target_config(), addr, val, times);
  } else {
  let loop_block = fx.bcx.create_block();
  + let loop_block2 = fx.bcx.create_block();
  let done_block = fx.bcx.create_block();
  let index = fx.bcx.append_block_param(loop_block, fx.pointer_type);
  let zero = fx.bcx.ins().iconst(fx.pointer_type, 0);
  fx.bcx.ins().jump(loop_block, &[zero]);
  fx.bcx.switch_to_block(loop_block);
  + let done = fx.bcx.ins().icmp_imm(IntCC::Equal, index, times as i64);
  + fx.bcx.ins().brnz(done, done_block, &[]);
  + fx.bcx.ins().jump(loop_block2, &[]);
  +
  + fx.bcx.switch_to_block(loop_block2);
  let to = lval.place_index(fx, index);
  to.write_cvalue(fx, operand);
  -
  let index = fx.bcx.ins().iadd_imm(index, 1);
  - let done = fx.bcx.ins().icmp_imm(IntCC::Equal, index, times as i64);
  - fx.bcx.ins().brz(done, loop_block, &[index]);
  - fx.bcx.ins().jump(done_block, &[]);
  + fx.bcx.ins().jump(loop_block, &[index]);
  fx.bcx.switch_to_block(done_block);
  }
  