Remove algo logic duplication Round 3

[François Dumont]

On 09/23/2013 10:30 PM, Paolo Carlini wrote:
> On 9/23/13 3:07 PM, François Dumont wrote:
>>
> Ok, you almost convinced me. Let's make sure Marc and the other 
> interested people have a further look at this for a few days and then 
> let's go ahead. I have one minor doubt: if I'm not misreading the 
> diff, I'm seeing _GLIBCXX_STD_A uses going away completely 
> (is_permutation?) and that seems suspect: can you please review those 
> and make sure everything is fine? In particular you should test 
> check-parallel. That code isn't really up to the C++11 requirements, 
> but not regressing should be very easy.

The removed ones are coming from the fact that I am now reusing an algo 
logic that is outside algo namespace so always in std namespace.

However running check-parallel did reveal that I miss some 
_GLIBCXX_STD_A on __mismatch calls. But if you run it on your side you 
will see that it is already broken for 2 other reasons. There are 
internal calls to std::equal rather than _GLIBCXX_STD_A::equal and 
parallel mode is missing C++11 mismatch overloads. I think I will fix 
those also with this patch, simply forwarding to normal mismatch from 
parallel mode for the missing parts.

I will commit in a couple of days once I have run all tests.

François