Revert "MMX in intra 4x4 prediction replaced with SSE2" This reverts commit 89a1efa4c436c58c101c8b3de866e3014be7d77a. This causes a segfault when decoding vp8, in both 32 and 64-bit Change-Id: Idbb9bb28ab897e1d055340497c47b49a12231367