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For strings we can't propagate the class-id because of externalization, but we still can record the compile-type (String). This is for example useful for eliminating number-checks with identical-comparisons. R=vegorov@google.com Review URL: https://codereview.chromium.org//966773002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@44133 260f80e4-7a28-3924-810f-c04153c831b5