Added new optimizations for MIPS that were removed in r6797. For more information about this see https://code.google.com/p/webrtc/source/detail?r=6797 R=andrew@webrtc.org, djordje.pesut@imgtec.com Review URL: https://webrtc-codereview.appspot.com/15259004 Patch from Ljubomir Papuga <ljubomir.papuga@mips.com>. git-svn-id: http://webrtc.googlecode.com/svn/trunk@7010 4adac7df-926f-26a2-2b94-8c16560cd09d