[patch] Make std::vector<bool> meet C++11 allocator requirements.

[Jonathan Wakely]

There's no better time to fix evil vector<bool> than Halloween.

All allocator operations must go through allocator_traits and
_Bit_type* must be replaced with the allocator's pointer type.

Rather than rewriting all the iterators and base classes to use
_Bit_pointer everywhere I only changed _M_end_of_storage and added
_M_end_addr() to convert it from _Bit_pointer to _Bit_type*, which
optimizes to nothing for the usual case where they're the same type.

Tested x86_64-linux, committed to trunk.

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