8169069: Module system implementation refresh (11/2016)
Reviewed-by: mcimadamore, jjg, mchung, anazarov
Contributed-by: jonathan.gibbons@oracle.com, jan.lahoda@oracle.com, alan.bateman@oracle.com, mandy.chung@oracle.com, bhavesh.x.patel@oracle.com, andrey.x.nazarov@oracle.com

8144733: Iterating over elements of a Scope can return spurious inner class elements
Summary: When a Symbol is removed from a Scope while iterating over it, update the iterator as well to reflect the change.
Reviewed-by: mcimadamore