Currently, when calling TypeArrayOop::size(), we end up calling klass() twice: once before calling into size_given_klass() and then again before calling TypeArrayOop::object_size().

This is currently only a minor performance nuisance.

With upcoming Shenandoah's elimination of forwarding pointer, loading klass like this is not safe anymore, and therefore we only call size_given_klass(), and must avoid calling naked klass() altogether.