RFR: 8027924: gc/metaspace/CompressedClassSpaceSizeInJmapHeap.java fails with warning

[Erik Helin]

Hi all,

this small patch ensures that the test 
hotspot/test/gc/metaspace/CompressedClassSpaceInJmapHeap.java checks 
that it is running on a 64-bit JVM, since compressed class space is not 
present on 32-bit JVMs.

Webrev:
http://cr.openjdk.java.net/~ehelin/8027924/webrev.00/

Testing:
- Run test on both 32-bit and 64-bit JVM

Thanks,
Erik