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

src/extensions/free-buffer-extension.h

Index: src/extensions/free-buffer-extension.h
diff --git a/src/extensions/gc-extension.h b/src/extensions/free-buffer-extension.h
similarity index 80%
copy from src/extensions/gc-extension.h
copy to src/extensions/free-buffer-extension.h
index e412b92a4d997aad87160ddd789b85419bdf3037..29ffbc014ecd8c073adb783cfe8d1888e88ab921 100644
--- a/src/extensions/gc-extension.h
+++ b/src/extensions/free-buffer-extension.h
@@ -1,4 +1,4 @@
-// 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:
@@ -25,23 +25,24 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#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_