Step 3 (of N?) fixing bug 16599

[Marshall Clow]

Make std::get constexpr.
This affects std::array (which needs some changes), std::pair, and std::tuple.
Includes tests for array and pair.

No tests for tuple yet, because while get(tuple) is marked as constexpr, it isn't really - yet.
This is not a problem because, tuple's constructors (and make_tuple) aren't constexpr either - yet.

Fixing both of those will be step #4.

-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki
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