[PATCH] [libc++] Fix PR20084 - std::is_function<void() const> failed.

[Eric Fiselier]

Hi mclow.lists, rsmith, K-ballo,

This patch introduces some black magic to detect const and volatile qualified function types such as `void () const`. I'm not quite sure how it works.

This fixes PR20084 - http://llvm.org/bugs/show_bug.cgi?id=20084

http://reviews.llvm.org/D7573

Files:
  include/type_traits
  test/std/utilities/meta/meta.unary/meta.unary.cat/function.pass.cpp

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