[Patch] Fix __len overflows (take 2)

[Paolo Carlini]

Hi,

the below tries to incorporate to my best Nathan's comments: first,
we check that max_size() will not be exceeded, then, in case __len
overflows, we allocate exactly max_size(). The underlying logic is
that max_size() is the real point of reference wrt the max possible
size of a vector and is supposed to reflect what the system can
really achieve.

I'm finishing testing on x86 and x86_64 and would like to commit
the patch tomorrow if it's fine with everyone...

Paolo.

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