C++ PATCH for template template parameter bugs c++/30897 and c++/29236

[Jason Merrill]

A couple of problems with template template parameters.  In 30897, the 
previously added code for dealing with default arguments in a template 
template parameter didn't handle uses of the parameter in a member 
template.  In 29236, substitution of a friend template to reduce its 
template parameter levels failed to handle the parameters of a template 
template parameter.

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