[v3] Use move_if_noexcept in std::vector

[Paolo Carlini]

Hi,

the below starts using it, for correctness wrt move constructors which 
can throw. For sure we are missing the optimization which uses the 
default-constructor + swap when the type isn't nothrow move 
constructible, per Note 5 in n3050, for example.

Tested x86_64-linux, committed.

Paolo.

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