[Patch] Speed up parsing of ints and floats (in the "C" locale)

[Paolo Carlini]

Benjamin Kosnik wrote:

>>+      template<typename _CharT2>
>>+        typename __enable_if<int, __is_char<_CharT2>::__value>::__type
>>+        _M_find(const _CharT2*, size_t __len, _CharT2 __c) const
>>    
>>
>very nice!
>  
>
Thanks Benjamin ;) The below slight variant is going in... Tested 
x86/ia64-linux.

Paolo.

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