[PATCH] Fix libstdc++/6503

[Paolo Carlini]

B. Kosnik wrote:

>>Ok for trunk and branch?
>>    
>>
>
>I think so: this just adds the operators, but they are not instantiated
>in the libstdc++.so binary, are they?
>
Indeed I believe they aren't. In fact, a grep for the word "deque" finds 
nothing in libstdc++-v3/src...
But this reminds me of this sentence of yours:

> Also, at some point, perhaps a written guideline on what constitutes a
> non-ABI-breaking patch should be formulated.


I wholly agre!!!

Paolo.