[C++ Patch] PR 58457

[Paolo Carlini <paolo dot carlini at oracle dot com>]

Hi,

in this 4.8/4.9 Regression having to do with using declarations we ICE 
at the gcc_assert in instantiate_type:

   gcc_assert (TREE_CODE (rhs) == ADDR_EXPR
           || TREE_CODE (rhs) == COMPONENT_REF
           || really_overloaded_fn (rhs)
           || (flag_ms_extensions && TREE_CODE (rhs) == FUNCTION_DECL));

because really_overloaded_fn (rhs) is false. Marek figured out that the 
ICE started with the representation change:

    http://gcc.gnu.org/viewcvs/gcc?view=revision&revision=184873

which means that OVERLOADs are *always* built for using-decls. Thus I 
think it could make sense to simply loosen a bit the gcc_assert. The 
below passes testing + fixes c++/57444 too.

Thanks,
Paolo.

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