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

[Marshall Clow]

There are 12 different qualifiers that can go on functions.

  const
  volatile
  &
  &&

Since `&` and `&&` are mutually exclusive, that leaves 12 different possibilities.
I only see tests for four here.

I'd love a `remove_qualifiers` type trait that took a function type and returned the unqualified type. That would be useful in several places; but the only way I've figured out how to do it involves tons of specializations (and even more for the non-variadic compilers).


http://reviews.llvm.org/D7573

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