RFR(S) 8207765: HeapMonitorIntervalRateTest fails with ZGC

[JC Beyler]

Hi all,

Could I have a few reviews of:
http://cr.openjdk.java.net/~jcbeyler/8207765/webrev.00/

The  test assumed the size of a 1-element array but ZGC changes that
assumption. The test now first allocates a bit of memory and gets the
average size of the samples before assuming the size. This works
with/without ZGC.

Webrev: http://cr.openjdk.java.net/~jcbeyler/8207765/webrev.00/
Bug: https://bugs.openjdk.java.net/browse/JDK-8207765

Thanks!
Jc
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