Give correct value ranges to enumeration types used as opaque types.

src/platform.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 342 matching lines @@
 // Thread
 //
 // Thread objects are used for creating and running threads. When the start()
 // method is called the new thread starts running the run() method in the new
 // thread. The Thread object should not be deallocated before the thread has
 // terminated.
 
 class Thread: public ThreadHandle {
  public:
   // Opaque data type for thread-local storage keys.
-  enum LocalStorageKey {};
+  // LOCAL_STORAGE_KEY_MIN_VALUE and LOCAL_STORAGE_KEY_MAX_VALUE are specified
+  // to ensure that enumeration type has correct value range (see Issue 830 for
+  // more details).
+  enum LocalStorageKey {
+    LOCAL_STORAGE_KEY_MIN_VALUE = kMinInt,
+    LOCAL_STORAGE_KEY_MAX_VALUE = kMaxInt
+  };
 
   // Create new thread.
   Thread();
   virtual ~Thread();
 
   // Start new thread by calling the Run() method in the new thread.
   void Start();
 
   // Wait until thread terminates.
   void Join();
@@ skipping 194 matching lines @@
   bool active_;
   PlatformData* data_;  // Platform specific data.
   DISALLOW_IMPLICIT_CONSTRUCTORS(Sampler);
 };
 
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 } }  // namespace v8::internal
 
 #endif  // V8_PLATFORM_H_