Disable heap iteration for Shenandoah in SA

[Roman Kennke]

> On 11/28/18 8:25 PM, Roman Kennke wrote:
>> Shall I commit my last proposed patch? Or only cut it into the
>> upstreaming patch, and leave sh/jdk alone for now?
> 
> Commit the last patch to sh/jdk (make sure no superfluous "ZGC" strings). There is no need to divert
> sh/jdk and what we are upstreaming, for our own sanity, at least.

Ok, done. The need to divert would have been if we break jstack or such.

Thanks,
Roman