diff -r fa380b3b2b7d -r 45c1fde86050 src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp
--- a/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Tue Jun 26 13:50:59 2018 -0700
+++ b/src/hotspot/share/gc/z/c2/zBarrierSetC2.cpp	Tue Jun 26 16:59:38 2018 -0400
@@ -653,7 +653,6 @@
     return p;
   }
 
-  bool conc_root = (access.decorators() & IN_CONCURRENT_ROOT) != 0;
   bool weak = (access.decorators() & ON_WEAK_OOP_REF) != 0;
 
   GraphKit* kit = access.kit();