RFR 8182270: JShell API: snippet information / 8166334: jshell tool: shortcut: expression/statement to method

[Robert Field]

Please review --

Bugs:

     JShell API: Tools need snippet information without evaluating snippet
     https://bugs.openjdk.java.net/browse/JDK-8182270

     jshell tool: shortcut: expression/statement to method
     https://bugs.openjdk.java.net/browse/JDK-8166334

Webrev:

     http://cr.openjdk.java.net/~rfield/8182270v0.webrev/

Thanks,
Robert