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

[Nils Eliasson]

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 
<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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