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If range analysis infered that integer definition is within Int32 range then it is guaranteed to be either Smi or Mint. BUG=http://dartbug.com/21763 R=fschneider@google.com Review URL: https://codereview.chromium.org//770303002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@42065 260f80e4-7a28-3924-810f-c04153c831b5