[cxx0x] stl_pair update patch

[Chris Fairles]

Wrote up a patch implementing 20.2.3 from N2369. Few questions:

In the 'bits' headers, should I be using the __GXX_EXPERIMENTAL_CXX0X__
macro to add cxx0x-only functionality? 

I get circular-dependancy nightmares if I try to #include <utility> from
within a "bits" header included from utility itself. Is the way I'm fwd
declaring the type traits and identity/move/forward a satisfactory solution?

I modified stl_algobase to make std::swap take rvalue ref's and does the
"triple-move". If thats the case, then should the pair's swap std::move()
first and second into std::swap? 

Cheers,
Chris

http://www.nabble.com/file/p12484504/gcc-cxx0x-stl-pair.patch
gcc-cxx0x-stl-pair.patch 
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