RFR: 8204168: Increase small heap sizes in tests to accommodate ZGC

[Per Liden]

Looks good to me.

/Per

On 05/31/2018 02:32 PM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to increase the heap size for tests that sets a 
> small heap size.
> 
> http://cr.openjdk.java.net/~stefank/8204168/webrev.01
> https://bugs.openjdk.java.net/browse/JDK-8204168
> 
> This change is needed to test ZGC with these tests. ZGC doesn't use 
> compressed oops and has an allocation memory reserve for the GC thread, 
> and hence have a higher smallest heap size compared to other GCs in the 
> code base.
> 
> There are some alternatives to this patch that we could consider (but I 
> prefer the suggested patch):
> 
> 1) Disable these tests when running with ZGC
> 
> 2) Split all these tests into two copies, one copy for ZGC and another 
> for the other GCs.
> 
> I've been running all of these changes through tier{1,2,3} and most of 
> them has been run in tier{4,5,6}.
> 
> Thanks,
> StefanK