add type for GlobalConfig.in_recomputing
add type for GlobalConfig.in_recomputing

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