The unnecessary upcast to (int) will be cleaned later. BUG=webm:1450 Change-Id: Ia234575206d5a74540526924b06ed3939322d063
Roughly 2x speedup. Since the only change for HBD is to store(), the improvement appears to hold there as well. BUG=webm:1424 Change-Id: I15b813d50deb2e47b49a6b0705945de748e83c19