Implement the basics of implicit instantiation of class templates, in

response to attempts to diagnose an "incomplete" type. This will force
us to use DiagnoseIncompleteType more regularly (rather than looking at
isIncompleteType), but that's also a good thing.

Implicit instantiation is still very simplistic, and will create a new
definition for the class template specialization (as it should) but it
only actually instantiates the base classes and attaches
those. Actually instantiating class members will follow. 

Also, instantiate the types of non-type template parameters before
checking them,  allowing, e.g., 

  template<typename T, T Value> struct Constant; 
 
to work properly.

llvm-svn: 65924

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