Fix merge bustage.

js/src/jsval.h

@@ -293,6 +293,7 @@ typedef enum JSWhyMagic
     JS_UNASSIGNED_ARGUMENTS,     /* the initial value of callobj.arguments */
     JS_OPTIMIZED_ARGUMENTS,      /* optimized-away 'arguments' value */
     JS_IS_CONSTRUCTING,          /* magic value passed to natives to indicate construction */
+    JS_OVERWRITTEN_CALLEE,       /* arguments.callee has been overwritten */
     JS_ION_ERROR,                /* error while running Ion code */
     JS_GENERIC_MAGIC             /* for local use */
 } JSWhyMagic;