About 40% faster than the non-rd version. BUG=webm:1424 Change-Id: Ia99d14eb9532302eeaab8cd3e503395b0374b5a2
Almost 3x faster in constrained loop testing. Over 10x faster in HBD builds. BUG=webm:1424 Change-Id: I2b7f8453e1d4ada63cde729d8115d684c4a71ff9