smooth_pred: 1D weights array to use less memory.

As the block sizes are powers of two, we can index into the weights
array as sm_weights_array[bs] now.

This uses 2 * MAX_BLOCK_DIM memory, instead of NUM_BLOCK_DIMS *
MAX_BLOCK_DIM earlier.

Change-Id: I55bcedc188b8ed7def719c4d002c1fe2ec5e1b7f
1 file changed