RFR: 8161604: TestNewSizeFlags fails with RuntimeException: max new size != MaxNewSize value

[Michail Chernov]

Hi,

Could I have a reviews for this change, please?

https://bugs.openjdk.java.net/browse/JDK-8161604
http://cr.openjdk.java.net/~mchernov/8161604/webrev.00/
http://cr.openjdk.java.net/~mchernov/8161604/webrev.hotspot.00/

The problem with test happens on host with huge pages size (64k). This 
causes to 32Mb heap alignment.

Test now uses heap alignment to check actual sizes of MaxHeapSize and 
InitialHeapSize. In case if they are equal MaxNewSize and NewSize are 
set to same value by the GC ergonomic.

Added new method to WhiteBox to get heap alignment value. The existing 
methods which are used in test and uses Parallel GC are guarded by 
INCLUDE_ALL_GCS and executed real code only if UseParallelGC is set.

Test case for NewSize=0 was removed because it can cause to VM 
initialization error (See https://bugs.openjdk.java.net/browse/JDK-8162420).

Added test case for MaxHeapSize == InitialHeapSize.

Testing is in progress.

Thanks,
Michail