Add missing size check to scatterFill.
Add missing size check to scatterFill.

Checks that the index tensor has the right shape.

luketwitter/cutorch,wickedfoo/cutorch,torch/cutorch,0wu/cutorch,yvan-sraka/cutorch,torch/cutorch,wickedfoo/cutorch,clementfarabet/cutorch,adamlerer/cutorch,Moodstocks/cutorch,luketwitter/cutorch,yvan-sraka/cutorch,torch/cutorch,Schakirov/cutorch_my,0wu/cutorch,clementfarabet/cutorch,Schakirov/cutorch_my,adamlerer/cutorch,Moodstocks/cutorch