[Patch] Fix libstdc++/13341 (speed-up <wchar_t>::do_narrow/widen)

[Paolo Carlini]

Benjamin Kosnik wrote:

>> 1- Construction time doubled.
>> 2- Memory usage doubled.
>
>
> ...both of these are one time hits. I think this is ok, given the 
> context (initialization).

Ok. The below are the corresponding changes: indeed, do_widen becomes 
really minimal and
even faster. Good.

Tested x86-linux, gnu/generic.

Will wait 'til monday.

Paolo.

P.S. Perhaps it's obvious for you, sorry, but I mention here that 
wctob(i) returns EOF
for all i : i > 127, already in the C locale.

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