RFR 8057006: Test classfilter_mozilla_compat.js fails with jcov

[A. Sundararajan]

Not sure I get the fix. Why this test should run with @fork mode? in 
particular, how this interacts with jcov? Are we masking some other 
issue that causes that NPE in the non- at forked mode?

-Sundar

Sergey Lugovoy wrote:
> Please review : http://cr.openjdk.java.net/~slugovoy/8057006/webrev.00/
> bug : https://bugs.openjdk.java.net/browse/JDK-8057006
>