src/cpu/aarch64/vm/aarch64.ad

rev 9032 : 8139042: AARCH64: Correct regression introduced by 8080293
    Summary: Reinstate unsafe volatile optimization broken by JDK-8080293
    Reviewed-by: duke

    Change logic of test to match change in return logic

@@ -2554,11 +2554,11 @@
     }
     // we must have dropped the load
     if (ld == NULL) {
       // check for a child cpuorder membar
       MemBarNode *child  = child_membar(barrier->as_MemBar());
-      if (child && child->Opcode() != Op_MemBarCPUOrder)
+      if (child && child->Opcode() == Op_MemBarCPUOrder)
         return true;
     }
   }
 
   // final option for unnecessary mebar is that it is a trailing node