[PATCH] Exploit move semantics in std::accumulate.

[Paolo Carlini]

... for concreteness, this is what I actually tested. Seems safe to me,
being restricted to string / wstring (eg, no problem with basic_string
specializations), I can't see how the user could detect the
optimization. I'd like to apply the change in order to continue
experimenting with the nice idea...

Thanks,
Paolo.

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