halide: Increase input size for blur
halide: Increase input size for blur

Sierangho/opentuner,ucb-sejits/opentuner,jbosboom/opentuner,phrb/opentuner,lazyparser/opentuner,lazyparser/opentuner,phrb/opentuner,jansel/opentuner,Sierangho/opentuner,jansel/opentuner,Sierangho/opentuner,jbosboom/opentuner,lazyparser/opentuner,Sierangho/opentuner,ucb-sejits/opentuner,lazyparser/opentuner