C++ PATCH for c++/51889 (problem overloading function using in template)

[Jason Merrill]

When we have a class-scope using-declaration that nominates functions, 
we want to insert those functions into the derived class' 
CLASSTYPE_METHOD_VEC.  In non-template code we do this in 
handle_using_decl, which is called from check_bases_and_members.  But we 
don't call that function for a class template definition.  Previously, 
for templates we were inserting them from finish_member_declaration, but 
that leads to name collisions if a function with the same signature is 
declared after the using-declaration, as in this testcase.  So this 
patch delays inserting the used function until finish_struct time, to 
match the non-template case.

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