Improve diagnostic for attempt to partially specialize member function

[Александр Кошло]

Hello!

According to description in bug
http://llvm.org/bugs/show_bug.cgi?id=6896 compiler should provide
better diagnostic in case of partial function template specialisation.
I would like to ask for review of my patch for this issue. I've used
"err_function_template_partial_spec" to describe the error.

Thanks, Oleksandr Koshlo
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