Move return value where RVO does not work
Move return value where RVO does not work

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