RFR (trivial): 8214217: [TESTBUG] runtime/appcds/LotsOfClasses.java failed on solaris sparcv9

[Jiangli Zhou]

Please review the following test fix, which sets the java heap size to 
3G for dumping with large number of classes.

   webrev: http://cr.openjdk.java.net/~jiangli/8214217/webrev.00/

   bug: https://bugs.openjdk.java.net/browse/JDK-8214217

Tested with tier1 and tier3. Also ran the test 100 times on 
solaris-sparcv9 via mach5.

Thanks,

Jiangli