Cory Fields 1d58cc7cb0 span: add lifetimebound attribute
See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0936r0.pdf for
reference.

This helps to guard against dangling references caused by construction from
temporaries such as:

    Span<const int> sp(std::vector<int>{1,2,3});
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