[patch] Simplify std::tuple helpers and fix C++14 bug.

[Jonathan Wakely]

On 15/05/14 11:38 +0100, Jonathan Wakely wrote:
>On 15/05/14 07:36 +0200, Daniel Krügler wrote:
>>Looking at the definition of the new alias
>>
>>__cv_tuple_size
>>
>>you might want to apply LWG 2313
>>
>>http://cplusplus.github.io/LWG/lwg-defects.html#2313
>>
>>and simplify its definition even further.
>
>I forgot about that. With that resolution the __cv_tuple_size alias
>doesn't seem worth using, it's simple enough anyway. Thanks!
>
>Tested x86_64-linux, committed to trunk.

Here's a simpler patch for the 4.9 branch, just fixing the bug and
implementing the DR, committed.
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