C++ PATCH for c++/47999 (incorrect auto deduction in template)

[Jason Merrill]

In templates, we do overload resolution and then throw away most of it, 
going back to the pre-conversion arguments.  But when the call returns a 
reference, we shouldn't elide the dereference and pretend it returns by 
value, as that confuses lvalue_p.

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

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