manual(hacky) impl of asinh and acosh for cuda
manual(hacky) impl of asinh and acosh for cuda

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