Omit total_size check in IndexIterator::operator++
Omit total_size check in IndexIterator::operator++

jnishi/chainer,hvy/chainer,wkentaro/chainer,jnishi/chainer,chainer/chainer,hvy/chainer,tkerola/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,ktnyt/chainer,pfnet/chainer,hvy/chainer,chainer/chainer,jnishi/chainer,niboshi/chainer,niboshi/chainer,okuta/chainer,ktnyt/chainer,okuta/chainer,wkentaro/chainer,okuta/chainer,niboshi/chainer,keisuke-umezawa/chainer,niboshi/chainer,chainer/chainer,wkentaro/chainer,keisuke-umezawa/chainer,chainer/chainer,ktnyt/chainer,ktnyt/chainer,wkentaro/chainer,jnishi/chainer,hvy/chainer