MIPS: MIPS32r1: Added optimization for QuantizeBlock

Change-Id: I6047ab107e4d474e35b5af1dac391d5b3d8c049b
MIPS: MIPS32r1: Added optimization for Disto4x4 (TTransform)

Change-Id: Ieb20c5c52b964247cfe46f45f9a7415725bf7c02