ES6 symbols: Implement Symbol intrinsic and basic functionality

src/code-stubs.cc

 // 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 358 matching lines @@
       break;
     case CompareIC::HEAP_NUMBER:
       GenerateHeapNumbers(masm);
       break;
     case CompareIC::STRING:
       GenerateStrings(masm);
       break;
     case CompareIC::INTERNALIZED_STRING:
       GenerateInternalizedStrings(masm);
       break;
+    case CompareIC::UNIQUE_NAME:
+      GenerateUniqueNames(masm);
+      break;
     case CompareIC::OBJECT:
       GenerateObjects(masm);
       break;
     case CompareIC::KNOWN_OBJECTS:
       ASSERT(*known_map_ != NULL);
       GenerateKnownObjects(masm);
       break;
     case CompareIC::GENERIC:
       GenerateGeneric(masm);
       break;
@@ skipping 240 matching lines @@
   // already active, as the hooks won't stack.
   if (entry_hook != 0 && entry_hook_ != 0)
     return false;
 
   entry_hook_ = entry_hook;
   return true;
 }
 
 
 } }  // namespace v8::internal