RFR(XS): 8226302: Test failures on IBM platforms (power and s/390) after JDK-8223837

[Florian Weimer]

* Martin Doerr:

> I'd like to fix the heap size related issues described in
> https://bugs.openjdk.java.net/browse/JDK-8226302
> by adjusting the sizes. I prefer this simple approach for jdk13.

<https://bugs.openjdk.java.net/browse/JDK-8226302?focusedCommentId=14272033&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-14272033>

Where do you see 16 KiB pages on s390?  I think s390 is thoroughly 4 KiB
only.  Unlike POWER, where some distributions boot with 4 KiB pages, and
others with 64 KiB pages (likewise for AArch64).

Thanks,
Florian