Do not copy memory layout related members in copy ctor
Do not copy memory layout related members in copy ctor

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