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During profiling of the Dart API app I noticed quite a non-trivial amount of time and garbage in nodes.addAll. This case can be optimized for the case where we know that both lists are node lists. BUG= Review URL: https://codereview.chromium.org//12382022 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@19268 260f80e4-7a28-3924-810f-c04153c831b5