--- old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	2019-10-31 00:11:28.835533525 -0400
+++ new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.hotspot/src/org/graalvm/compiler/hotspot/replacements/HotSpotReplacementsUtil.java	2019-10-31 00:11:27.682520179 -0400
@@ -308,11 +308,13 @@
 
     @Fold
     public static int osThreadOffset(@InjectedParameter GraalHotSpotVMConfig config) {
+        assert config.osThreadOffset != Integer.MAX_VALUE;
         return config.osThreadOffset;
     }
 
     @Fold
     public static int osThreadInterruptedOffset(@InjectedParameter GraalHotSpotVMConfig config) {
+        assert config.osThreadInterruptedOffset != Integer.MAX_VALUE;
         return config.osThreadInterruptedOffset;
     }