libc++ PATCH - partial implementation of LWG 2350 - min, max, and minmax should be constexpr

[Marshall Clow]

Implements for min/max, and some of the minmax specializations.
In particular, the minmax(initializer_list) is not complete.

http://cplusplus.github.io/LWG/lwg-active.html#2350

— Marshall

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