[13] RFR(XS):8226287: Make process_users_of_allocation handle gc barriers

[Vladimir Kozlov]

Looks good but run all testing before push.

Thanks
Vladimir

> On Jun 19, 2019, at 5:49 AM, Nils Eliasson <nils.eliasson at oracle.com> wrote:
> 
> Hi,
> 
> This patch fixes a minor problem in process_users_of_allocation in macro.cpp. When removing the initalize node we must handle the case that there is a gc barrier in the control flow.
> 
> This patch strengthens the requirement that the zgc loadbarrier node has a control out when expanding.  
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8226287
> 
> Webrev: http://cr.openjdk.java.net/~neliasso/8226287/webrev.01/
> 
> Please review,
> 
> Regards,
> 
> Nils
> 
> 
> 
> 
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