RFR: 8217850: CompressedClassSpaceSizeInJmapHeap fails after JDK-8217612

[Yasumasa Suenaga]

Hi all,

Please review this change:

  JBS: https://bugs.openjdk.java.net/browse/JDK-8217850
  webrev: https://bugs.openjdk.java.net/browse/JDK-8217850

This change passed tests on submit repo, and 
test/hotspot/jtreg/gc/metaspace/CompressedClassSpaceSizeInJmapHeap.java on my 
Linux x64 box.


Thanks,

Yasumasa