[11u] RFR (XS) 8251949: ZGC: Set explicit heap size for compiler/gcbarriers tests

[Per Liden]

Looks good.

/Per

On 9/2/20 7:09 PM, Aleksey Shipilev wrote:
> On 8/19/20 4:23 PM, Aleksey Shipilev wrote:
>> 11u-specific bug:
>>     https://bugs.openjdk.java.net/browse/JDK-8251949
>>
>> I suggested doing that in jdk/jdk initially, and then backport, but 
>> Per suggested it is best to do
>> in 11u specifically.
>>
>> 11u webrev:
>>     https://cr.openjdk.java.net/~shade/8251949/webrev.11u.01/
> 
> Friendly reminder: the absence of this still makes at least mine tier1 
> runs unclean. :)
>