Use CUDA_ADD_EXECUTABLE for xchainer_test
Use CUDA_ADD_EXECUTABLE for xchainer_test

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