Add _GET_BILINEAR_INTERP_PARAMS to remove duplicate code in kernel
Add _GET_BILINEAR_INTERP_PARAMS to remove duplicate code in kernel

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