RFR 8055284: sanity/WhiteBox.java fails with NPE

[Mikael Gerdin]

Hi all,

sanity/WhiteBox.java was mistakenly modified by a recent mass-update of 
jtreg whitebox tests to allow them to pass with the -Xverify:all flag.
The problem is that sanity/WhiteBox.java is a special test which 
provides its own version of the sun.hotspot.WhiteBox class.

The change is therefore not applicable to the test and the nested 
WhiteBoxPermission class does not exist, causing the test to fail with 
an NPE because of the missing class file.

Webrev: http://cr.openjdk.java.net/~mgerdin/8055284/webrev.0/

Bug: https://bugs.openjdk.java.net/browse/JDK-8055284

Thanks to Dmitry Fazunenko for putting the suggested fix into the bug 
comments, I'll put his name as a contributor on the changeset.

/Mikael