JDK 9 RFR of JDK-8173609: Elements.printElements needs to support modules

[joe darcy]

Hello,

Please review the straightforward fix to address:

     JDK-8173609: Elements.printElements needs to support modules
     http://cr.openjdk.java.net/~darcy/8173609.0/

Once additional information about modules is available (JDK-8172810: 
ModuleElement should declare and provide appropriate modifiers), the 
printing processor should be updated to expose that information.

Admittedly this changeset would be better with some regression testing.

Thanks,

-Joe