When solving this bug https://phabricator.services.mozilla.com/D24009. I need 
to write a test. The bug is basically caused by overlooking the possible 
wrapper around an ArrayBufferView that is checked by 
JS_IsArrayBufferViewObject().

See 
https://searchfox.org/mozilla-central/source/js/src/vm/ArrayBufferViewObject.cpp#164,
 the check will return true if canUnwrapAs<ArrayBufferViewObject>(), it's 
possible that the object itself is not an ArrayBufferView.

In the test, I want to make sure the object is indeed a wrapped one. Is there a 
reliable way to write JavaScript code to achieve this?

Thanks!
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