[Patch] Fix aliasing (/alignment) issue in ext/pb_assoc

[Paolo Carlini]

Hi all, hi Benjamin,

as pointed out by Chris here:

    http://gcc.gnu.org/ml/libstdc++/2005-12/msg00232.html

and discussed a bit here:

    http://gcc.gnu.org/ml/libstdc++/2006-01/msg00013.html

We have got this aliasing/alignment issue, which, as far as I can see,
is a perfect candidate for a neat use of
tr1::aligned_storage/alignment_of. Indeed, the below appear to work
well, and the warning is gone. Any objections to this approach? Would be
for 4.1 branch too.

Thanks,
Paolo.

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