RFR: 8231251: ZGC: Fix ZHeap includes

[Per Liden]

Thanks!

/Per

On 9/24/19 11:34 AM, erik.osterlund at oracle.com wrote:
> Hi Per,
> 
> Looks amazing.
> 
> Thanks,
> /Erik
> 
> On 09/19/2019 04:41 PM, Per Liden wrote:
>> I noticed that the ZHeap includes needed a bit of a cleanup, as there 
>> are many includes that are not longer needed, and a few are missing.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8231251
>> Webrev: http://cr.openjdk.java.net/~pliden/8231251/webrev.0
>>
>> /Per
>