Add __shim_type_info which fits below std::type_info and above all of the...

Add __shim_type_info which fits below std::type_info and above all of the other type_info-derived classes.  This is where all of the virtual functions that serve as details of the inner-workings of type_info will live (safely hidden from public view).  All type_info objects will be safely down-castable to __shim_type_info, so as to access implementation detail virtual functions.  Also temporarily add some print/display statements to each type_info-derived class.  This is in support of the continuing development on the personality function.

llvm-svn: 148647