Attempt to make std::pair piecewise constructor noexcept

[François Dumont]

Hi

 Â Â Â  I had a try to make std::pair piecewise constructor noexcept 
qualified as you'll see in the attached diff. It will help to have more 
move semantic in associative containers.

 Â Â Â  But it doesn't work, is_nothrow_constructible<pair<int, int>, 
piecewise_construct_t, tuple<int>, tuple<int>>::value still false.

 Â Â Â  Could you let me know before I lose too much time if it is feasible 
or not ? Or at least if I am on the right path.

Thanks for any help,

François

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