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flow_graph_optimizer.cc is becoming unnecessarily large, so I'm moving self-contained optimization passes into separate files. In a separate CL I'll also move load/store optimization into separate files. R=srdjan@google.com Review URL: https://codereview.chromium.org//820883004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42567 260f80e4-7a28-3924-810f-c04153c831b5