[v3] Fix C++0x pair constructors

[Paolo Carlini]

On Oct 18, 2008, at 12:45 AM, Paolo Carlini wrote:

> Doug Gregor wrote:
>> Tested i686-pc-linux-gnu; no regressions.
>>
> Approved for mainline of course, thanks Doug. Now I can also  
> confidently
> implement the "emplace" additions to map / multimap / ... which rely  
> on
> a sane std::pair.

I went ahead and committed the patch to support the above-mentioned  
work on the containers...

Paolo.