C++ PATCH for c++/34950 (crash resolving overloaded template function)

[Jason Merrill]

We need to do the same thing in this case that we do for partial 
ordering: set processing_template_decl while we do tsubsting that might 
not remove all uses of template parameters.

Tested x86_64-pc-linux-gnu, applied to trunk and 4.3; 4.2 and 4.1 to 
follow soon.

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