[Patch] Batch of basic_string correctness and performance work

[Paolo Carlini]

Paolo Carlini wrote:

> Please, test a bit the attached and provide some feedback at your ease,
> we have still a good amount of time before 4.0.0...

I have just committed the below: in fact, on x86, some testcases, when 
statically
linked get a little bit of additional performance improvement. This is 
not the
case on x86_64, where we give away a few % on some tests, but I concur that
this is a safer approach and, more important... I don't want Gawain-full 
nightmares
for the next two nights, so... ;) ;)

Paolo.

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