[patch] [C++14] Implement N3657: heterogeneous lookup in associative containers.

[Jonathan Wakely]

This is the last missing piece of the C++14 library, as proposed in
http://www.open-std.org/JTC1/sc22/wg21/docs/papers/2013/n3657.htm

Tested x86_64-linux, *not* committed.

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