[eigen] Return type of eval() for non-plain-object should not be const qualified

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Hi all, 

I want to check with the list if this is as intended (and I'm missing some big picture) or a bug:

Currently T::eval() either returns a const reference if T is a plain object, which is fine, or a const object if T is an _expression_. I think evaluating an _expression_ should return just an object, not a const qualified object. This enables move assignment optimization that takes the result from evaluation, and return it directly, without creating a temporary copy.

The relevant line is:

 typedef typename internal::add_const_on_value_type<typename internal::eval<Derived>::type>::type EvalReturnType;

in DenseBase.h


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