RFR: 8173943: Change error reporting of LauncherHelper to include actual Error class name

[Ramanand Patil]

Hi all,
Please review the following trivial bug fix:
Bug: https://bugs.openjdk.java.net/browse/JDK-8173943
Webrev: http://cr.openjdk.java.net/~rpatil/8173943/webrev.00/

LinkageError message added by - https://bugs.openjdk.java.net/browse/JDK-8167063 is updated to include the Error Class name.

Regards,
Ramanand.