Implementes [[ http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0356r5.html | P0356R5 ]]. Adds `bind_front` to `functional`. Reviewed By: ldionne, #libc, Quuxplusone Differential Revision: https://reviews.llvm.org/D60368  | 
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| not_fn.pass.cpp | ||