New const char* ctor for C++-0x

[Ed Smith-Rowland]

Here is a patch for just the const char* constructor for bitset.  This 
is bootstrapped and regtested on x86_64.

I'm not sure why I noticed this (maybe thinking about dynamic_bitset for 
TR2).

I think I'll try to look for two classes of additions to the std library 
(especially the old part):
1. long long either in place of or in addition to long
2. char* overloads where there was already a string version and vice versa.
Has anyone else done this (including the std::people)?   Is there a 
grand unified diff somewhere?

Also, bitset has a unsigned long -> unsigned long long ctor replacemens
and a new to_ullong() new accessor pending.

OK?

Ed

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