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- Bad reference counting in tree IR builder. - Incorrect visit order in StatementRewriter.visitSetField. - Bad hint assigned in IR builder for GetClosureVariable. BUG= R=sigurdm@google.com Review URL: https://codereview.chromium.org//807573003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42913 260f80e4-7a28-3924-810f-c04153c831b5