C++ PATCH for c++/57043 (wrong partial ordering)

[Jason Merrill]

We need to loosen the check for an exact match when we're doing partial 
ordering, because dealing with dependent types means we can't 
instantiate things like typenames to see what they end up being.  And 
it's not necessary because when we've gotten to partial ordering, we 
already know that both candidates are viable.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.8.
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