RFR: 8232070: ZGC: Remove unused ZVerifyLoadBarriers

[Thomas Schatzl]

Hi,

On 09.10.19 23:04, Per Liden wrote:
> After JDK-8230565, we left the develop flag ZVerifyLoadBarriers around, 
> which is no longer used and can be removed.
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8232070
> Webrev: http://cr.openjdk.java.net/~pliden/8232070/webrev.0

   looks good and trivial.

Thomas