8133300: Ensure symbol table immutability in Nashorn AST
Reviewed-by: hannesw, lagergren

8081809: Missing final modifier in method parameters (nashorn code convention)
Reviewed-by: attila, hannesw

8080598: Javadoc warnings in Global.java after lazy initialization
Reviewed-by: lagergren, hannesw

8067139: Finally blocks inlined incorrectly
Reviewed-by: hannesw, lagergren

8059843: Make AST serializable
Reviewed-by: hannesw, lagergren

8054834: Modular Source Code
Reviewed-by: alanb, chegar, ihse, mduigou
Contributed-by: alan.bateman@oracle.com, alex.buckley@oracle.com, chris.hegarty@oracle.com, erik.joelsson@oracle.com, jonathan.gibbons@oracle.com, karen.kinnear@oracle.com, magnus.ihse.bursie@oracle.com, mandy.chung@oracle.com, mark.reinhold@oracle.com, paul.sandoz@oracle.com