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Replace generic fix point range analysis algorithm based on widening and narrowing operators with an ad hoc single dominator tree pass. To improve precision discover initial value and direction of the growth for simple induction variables. R=fschneider@google.com BUG= Review URL: https://codereview.chromium.org//11283002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@14068 260f80e4-7a28-3924-810f-c04153c831b5