[PATCH] [libcxx] Move tuple_size and tuple_element overloads for pair and array out of !defined(_LIBCPP_HAS_NO_VARIADICS) block.

[Eric Fiselier]

Hi mclow.lists, danalbert, K-ballo,

There is no reason to guard `tuple_size`, `tuple_element` and `get<I>(...)` for pair and array inside of `<__tuple>` so that they are only available when we have variadic templates.
This requires there be redundant declarations and definitions. It also makes it easy to get things wrong.

For example the following code should compile (and does in c++11).
```
#define _LIBCPP_HAS_NO_VARIADICS
#include <array>

int main()
{
  static_assert((std::tuple_size<std::array<int, 10> volatile>::value == 10), "");
}
```

This patch lifts the non-variadic parts of `tuple_size`, `tuple_types`, and `get<I>(...)` to the top of `<__tuple>` where they don't require variadic templates. This patch also removes `<__tuple_03>` because there is no longer a need for it.

http://reviews.llvm.org/D7774

Files:
  include/__tuple
  include/__tuple_03
  include/array
  include/utility
  test/std/containers/sequences/array/array.tuple/tuple_element.pass.cpp
  test/std/containers/sequences/array/array.tuple/tuple_size.pass.cpp
  test/std/utilities/utility/pairs/pair.astuple/tuple_element.pass.cpp
  test/std/utilities/utility/pairs/pair.astuple/tuple_size.pass.cpp

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