C++ PATCH for c++/50086 (failure to handle template-id argument to variadic)

[Jason Merrill]

The standard says that if a template-id designates a single function, 
that is used when we don't have sufficient type information to guide 
deduction.  But we were getting this wrong when passing to a variadic 
parameter due to a simple logic error.

Tested x86_64-pc-linux-gnu, applying to trunk and 4.6.
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