RFR: 8209127: ZGC: Improve error message when failing to map memory for mark stacks

[Per Liden]

Thanks Erik!

/Per

On 08/08/2018 02:20 PM, Erik Österlund wrote:
> Hi Per,
> 
> Looks good.
> 
> Thanks,
> /Erik
> 
> On 2018-08-08 14:14, Per Liden wrote:
>> When failing to map memory for mark stacks, we currently always fail 
>> with the message "Mark stack overflow", regardless of what the error 
>> actually was. We should only say that if we actually exhausted the 
>> mark stack space.
>>
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8209127
>> Webrev: http://cr.openjdk.java.net/~pliden/8209127/webrev.0
>>
>> /Per
>