C++ PATCH for c++/43559 (wrong partial ordering)

[Jason Merrill]

My patch for c++/41703 added a same_type_p check before considering 
cv-qualifiers in partial ordering in order to deal with non-deduced 
template parms.  But the patch also deals with that issue with the new 
check_nondeduced_parms function, so the same_type_p check is 
unnecessary, and wrong in this case where the two types involve template 
type parameters with different indices.

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