ES6 symbols: Implement Symbol intrinsic and basic functionality

src/v8globals.h

 // Copyright 2012 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 255 matching lines @@
   // A generic handler is installed and no extra typefeedback is recorded.
   GENERIC,
   // Special state for debug break or step in prepare stubs.
   DEBUG_STUB
 };
 
 
 enum CheckType {
   RECEIVER_MAP_CHECK,
   STRING_CHECK,
+  SYMBOL_CHECK,
   NUMBER_CHECK,
   BOOLEAN_CHECK
 };
 
 
 enum CallFunctionFlags {
   NO_CALL_FUNCTION_FLAGS = 0,
   // Receiver might implicitly be the global objects. If it is, the
   // hole is passed to the call function stub.
   RECEIVER_MIGHT_BE_IMPLICIT = 1 << 0,
   // The call target is cached in the instruction stream.
   RECORD_CALL_TARGET = 1 << 1
 };
 
 
 enum InlineCacheHolderFlag {
   OWN_MAP,  // For fast properties objects.
-  PROTOTYPE_MAP  // For slow properties objects (except GlobalObjects).
+  DELEGATE_MAP  // For slow properties objects (except GlobalObjects).
 };
 
 
 // The Store Buffer (GC).
 typedef enum {
   kStoreBufferFullEvent,
   kStoreBufferStartScanningPagesEvent,
   kStoreBufferScanningPageEvent
 } StoreBufferEvent;
 
@@ skipping 262 matching lines @@
 
 enum ClearExceptionFlag {
   KEEP_EXCEPTION,
   CLEAR_EXCEPTION
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_