6587674: NoClassdefFound when anonymously extending a class. Reviewed-by: jjg, mcimadamore

6863465: javac doesn't detect circular subclass dependencies via qualified names Summary: class inheritance circularity check should look at trees, not just symbols Reviewed-by: jjg

5088624: cannot find symbol message should be more intelligent Summary: Resolve.java should keep track of all candidates found during a method resolution sweep to generate more meaningful diagnostics Reviewed-by: jjg