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Represent the distinction between computations whose value is used and computations whose value is unused with a data member (instead of a separate type). R=fschneider@google.com,srdjan@google.com BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//10700111 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9416 260f80e4-7a28-3924-810f-c04153c831b5