RFR: 8231774: ZGC: ZVirtualMemoryManager unmaps incorrect address

[Stefan Karlsson]

Looks good.

StefanK

On 2019-10-02 23:53, Per Liden wrote:
> When failing to map the requested address, map() in 
> ZVirtualMemoryManager.cpp, incorrectly calls unmap(start, size) instead 
> of unmap(res, size).
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8231774
> Webrev: http://cr.openjdk.java.net/~pliden/8231774/webrev.0
> 
> /Per