RFR: 8231563: ZGC: Fails to warn when user sets the max heap size to larger than 16TB

[Per Liden]

Looks good!

/Per

On 9/27/19 9:16 AM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this small patch to fix the max heap size check in ZGC.
> 
> https://cr.openjdk.java.net/~stefank/8231563/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8231563
> 
> After this fix the JVM refuses to start if a too high -Xmx is set:
> 
> $ java -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -Xmx17t -version:
> Error occurred during initialization of VM
> Java heap too large
> 
> Thanks,
> StefanK