Request for review: 8027915: TestParallelHeapSizeFlags fails with unexpected heap size on sparcv9

[Tao Mao]

Hi all,

8027915: TestParallelHeapSizeFlags fails with unexpected heap size on 
sparcv9
https://bugs.openjdk.java.net/browse/JDK-8027915

webrev:
http://cr.openjdk.java.net/~tamao/8027915/webrev.00/

changeset:
Modified the test code so that it can deal with the case of using large 
pages.

**Note* another failure of gc/arguments/TestMinInitialErgonomics.java 
mentioned in the CR is dealt with in a new CR JDK-8028254.

test:
Manually checked on Sparcv9 with 4M page value, as well as on my local 
machine to check that the code applies to regular cases, too.
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