RFR: 8209376: ZGC: Move ZMarkStackAllocator into a separate file

[Per Liden]

Thanks Kim!

/Per

On 08/14/2018 12:49 AM, Kim Barrett wrote:
>> On Aug 13, 2018, at 3:53 AM, Per Liden <per.liden at oracle.com> wrote:
>>
>> Break out the mark stack allocation logic from ZMarkStack.[ch]pp into ZMarkStackAllocator.[ch].pp.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8209376
>> Webrev: http://cr.openjdk.java.net/~pliden/8209376/webrev.0
>>
>> /Per
> 
> Looks good.
>