Request for Review (s) 8026752: Cancel MetaspaceGC request for a CMS concurrent collection after GC

[Jon Masamitsu]

https://bugs.openjdk.java.net/browse/JDK-8026752

If a concurrent CMS collection has been scheduled for Metaspace
needs, it should be cancelled if a full GC is done.

http://cr.openjdk.java.net/~jmasa/8026752/webrev.00/

Fix was verified with the new test TestMetaspaceCMSCancel.java
Stability testing was done with gc_test_suite.

Thanks.

Jon
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