RFR(xs): 8185263: Fix zero build after 8169881, 8175318, 8178350

[Severin Gehwolf]

Hi,

On Tue, 2017-07-25 at 19:13 +0200, Thomas Stüfe wrote:
> Hi all,
> 
> may I please have reviews and sponsor for these zero-related build fixes?
> 
> Issue: https://bugs.openjdk.java.net/browse/JDK-8185263
> webrev:
> http://cr.openjdk.java.net/~stuefe/webrevs/8185263-fix-zero-build/webrev.00/webrev/index.html

I can confirm Zero builds fine with this for me on x86_64 Linux
release/fastdebug/slowdebug variants.

Thanks,
Severin