src/java.base/share/classes/java/lang/reflect/Modifier.java

@@ -338,11 +338,12 @@
     static final int VARARGS   = 0x00000080;
     static final int SYNTHETIC = 0x00001000;
     static final int ANNOTATION  = 0x00002000;
     static final int ENUM      = 0x00004000;
     static final int MANDATED  = 0x00008000;
-    static final int FLATTENED = 0x00008000;
+    static final int FLATTENABLE = 0x00000100;
+    static final int FLATTENED   = 0x00008000;      // HotSpot-specific bit
     static boolean isSynthetic(int mod) {
       return (mod & SYNTHETIC) != 0;
     }
 
     static boolean isMandated(int mod) {