RFR (s) 8167185: JShell API: Exported elements referring to inaccessible types in jdk.jshell

[Robert Field]

Please review....

Bugs:

     8167185: JShell API: Exported elements referring to inaccessible 
types in jdk.jshell
     https://bugs.openjdk.java.net/browse/JDK-8167185

Sub-Task:

     8170406: JShell (jdk): remove exports exclusion from -Xlint for 
jdk.jshell
     https://bugs.openjdk.java.net/browse/JDK-8170406

Webrevs:

     http://cr.openjdk.java.net/~rfield/8167185v0.webrev/

     http://cr.openjdk.java.net/~rfield/8170406v0.webrev/

Thanks,
Robert