Step 2 (of N?) fixing bug 16599

[Marshall Clow]

This is the second step towards fixing http://llvm.org/bugs/show_bug.cgi?id=16599

Make std::pair's constructors and comparison operators (and make_pair) constexpr.

-- 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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