[Patch, v7] compare(string) optimization

[Paolo Carlini]

Hi,

we are missing this useful optimization, AFAICS.

Similarly to analogous situations in istream, for example, I believe
it's safe only for char / wchar_t, but in my opinion would be ok also
for any non-totally-crazy char_traits. Any comment about the last point
in particular?

Tested x86-linux, both bases, will go in mainline/4_1 too as ext/vstring.h

Paolo.

P.S. Took the occasion for an unrelated trivial tweak.

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