LGTM, just some comments.
http://gwt-code-reviews.appspot.com/1467801/diff/1/dev/core/test/com/google/gwt/dev/jjs/impl/gflow/DataflowOptimizerTest.java
File
dev/core/test/com/google/gwt/dev/jjs/impl/gflow/DataflowOptimizerTest.java
(right):
http://gwt-code-reviews.appspot.com/1467801/
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http://gwt-code-reviews.appspot.com/1467801/diff/1/dev/core/test/com/google/gwt/dev/jjs/impl/gflow/DataflowOptimizerTest.java
File
dev/core/test/com/google/gwt/dev/jjs/impl/gflow/DataflowOptimizerTest.java
(right):