MIPS: Implement CheckNotCharacterAfterMinusAnd.  This is a commit of http://codereview.chromium.org/9721011/ for Daniel Kalmar

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11314 ce2b1a6d-e550-0410-aec6-3dcde31c8c00