Provide "freeBuffer()" primitive for testing under ASan.

src/extensions/free-buffer-extension.h

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2013 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
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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-#ifndef V8_EXTENSIONS_GC_EXTENSION_H_
-#define V8_EXTENSIONS_GC_EXTENSION_H_
+#ifndef V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_
+#define V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_
 
 #include "v8.h"
 
 namespace v8 {
 namespace internal {
 
-class GCExtension : public v8::Extension {
+class FreeBufferExtension : public v8::Extension {
  public:
-  explicit GCExtension(const char* source) : v8::Extension("v8/gc", source) {}
+  explicit FreeBufferExtension(const char* source)
+      : v8::Extension("v8/free-buffer", source) {}
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name);
-  static void GC(const v8::FunctionCallbackInfo<v8::Value>& args);
+  static void FreeBuffer(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void Register();
 };
 
 } }  // namespace v8::internal
 
-#endif  // V8_EXTENSIONS_GC_EXTENSION_H_
+#endif  // V8_EXTENSIONS_FREE_BUFFER_EXTENSION_H_