Further extend TypedArray support in d8:

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 77ffb385ab97f34381177e4a39e2f01aec62fa94..f8883fc1de96e9839d3ed353597e417a2b69d6c3 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1551,6 +1551,12 @@ class Object : public Value {
   V8EXPORT Local<String> ObjectProtoToString();
 
   /**
+   * Returns the function invoked as a constructor for this object.
+   * May be the null value.
+   */
+  V8EXPORT Local<Value> GetConstructor();
+
+  /**
    * Returns the name of the function invoked as a constructor for this object.
    */
   V8EXPORT Local<String> GetConstructorName();