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This change provides getters and setters for a lazily allocated field associated with every heap allocated object. It is a generalization of the peer field of external string instances, external byte array instances, and the smrck field of closure instances. Review URL: https://chromiumcodereview.appspot.com//10905251 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12511 260f80e4-7a28-3924-810f-c04153c831b5