C++ PATCH to type_unification_real for c++/37766

[Jason Merrill]

We use convert_template_argument to make class template arguments match 
their corresponding parameters.  We don't normally do that for function 
template arguments because they're deduced, so they already match.  But 
that doesn't apply to explicit or default template arguments.  We were 
already doing the right thing for explicit arguments, but still needed 
to do the conversion for default arguments.

Tested x86_64-pc-linux-gnu, applied to trunk.
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