6721093: -XX:AppendRatio=N not supported

Add mechanism to ignore unsupported flags for a set period of time

Reviewed-by: acorn, never, coleenp

hotspot/src/share/vm/runtime/threadLocalStorage.hpp

@@ -47,6 +47,7 @@ class ThreadLocalStorage : AllStatic {
   // Initialization
   // Called explicitly from VMThread::activate_system instead of init_globals.
   static void init();
+  static bool is_initialized();
 
  private:
   static int     _thread_index;