C++ PATCH for c++/42466 (multiple instantiations of template class with template constructor failing)

[Jason Merrill]

The problem was that when we went to instantiate the member template, 
when creating the TEMPLATE_PARM_INDEX for the member template's non-type 
parameter, we saw that we already had one from a previous instantiation 
and didn't notice that the type was wrong.  Fixed by checking the type.

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