--- a/src/hotspot/share/c1/c1_Decorators.hpp	Thu Feb 14 15:27:12 2019 -0800
+++ b/src/hotspot/share/c1/c1_Decorators.hpp	Thu Feb 14 15:27:12 2019 -0800
@@ -34,5 +34,7 @@
 // Use the C1_MASK_BOOLEAN decorator for boolean accesses where the value
 // needs to be masked.
 const DecoratorSet C1_MASK_BOOLEAN   = DECORATOR_LAST << 2;
+// Use the C1_UNSAFE_ACCESS decorator to mark unsafe accesses.
+const DecoratorSet C1_UNSAFE_ACCESS  = DECORATOR_LAST << 3;
 
 #endif // SHARE_C1_C1_DECORATORS_HPP