[PATCH] Fix PR#22600: Wrong return type for operator() of "diamond functors"

[Marshall Clow]

Hi EricWF,

Make some simple C++ code much more complicated.
As a bonus, add noexcept specifications to all the 'diamond functors'

Fixes http://llvm.org/bugs/show_bug.cgi?id=22600

http://reviews.llvm.org/D7862

Files:
  include/__functional_base
  include/functional

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