[Patch] Add _M_grouping_len to the numpunct cache

[Paolo Carlini]

Hi,

the below completes the work, changing the last remaining C-string
to char array + length. In this case, we avoid both computing again
and again the string length and also constructing again and again
a basic_string from an immutable C-string in order to pass the former
to __verify_grouping. As a side effect, the tweaked __verify_grouping,
(taking now a const char* and a size_t) is 20 bytes smaller, i.e.,
576 bytes (-O2, stripped), its speed is the same.

An interesting tweak of this work is that __verify_grouping is not a
template anymore: I say interesting because, actually, there was _no_
real reason for that also _before_ the patch: the grouping, according
to the standard is always a basic_string<char>.

Tested x86-linux, will commit later today if nobody objects.

Paolo.

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