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For example we can't replace BinarySmiOp with Mint constant because we might have removed the checks based on the assumption that BinarySmiOp always returns a Smi. BUG=http://dartbug.com/22480 R=fschneider@google.com Review URL: https://codereview.chromium.org//938783003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43875 260f80e4-7a28-3924-810f-c04153c831b5