RFR (XS) 8189766: whitebox failure with -Xcheck:jni

[Kim Barrett]

> On May 29, 2018, at 3:06 AM, David Holmes <david.holmes at oracle.com> wrote:
> 
> bug: https://bugs.openjdk.java.net/browse/JDK-8189766
> webrev: http://cr.openjdk.java.net/~dholmes/8189766/webrev/
> 
> […]
> Thanks,
> David

Looks good.