RFR: 8209375: ZGC: Use dynamic base address for mark stack space

[Erik Österlund]

Hi Per,

Looks good.

Thanks,
/Erik

On 2018-08-13 09:53, Per Liden wrote:
> We're currently using a fixed address space range for the mark stack 
> space, both in terms of it's base address and it's size. This isn't 
> really needed, we could just as well let os::reserve_memory() pick and 
> address range for us and only reserve ZMarkStackSpaceLimit bytes, 
> instead of 1TB.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8209375
> Webrev: http://cr.openjdk.java.net/~pliden/8209375/webrev.0
>
> /Per