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Also M1 migration for 'operator negate()'. R=messick@google.com BUG= Review URL: https://chromiumcodereview.appspot.com//10913112 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11957 260f80e4-7a28-3924-810f-c04153c831b5