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

[Per Liden]

Thanks Thomas!

/Per

On 08/08/2018 02:36 PM, Thomas Schatzl wrote:
> Hi,
> 
> On Wed, 2018-08-08 at 14:14 +0200, 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
>>
> 
>    looks good.
> 
> In this and the other two changes I just reviewed, please consider
> updating copyright dates before pushing. No need for another review.
> 
> Thanks,
>    Thomas
>