7148164: attribution code for diamond should not rely on mutable state Summary: Update attribution code for diamond operator not to rely on mutable state Reviewed-by: jjg

7148242: Regression: valid code rejected during generic type well-formedness check Summary: Redundant type-var substitution makes generic-type well-formedness check to fail Reviewed-by: jjg

7132880: Resolve should support nested resolution contexts Summary: Overload resolution routine should be updated so that it can be called recursively Reviewed-by: jjg, dlsmith

Added tag jdk8-b29 for changeset cc866298b20c