re PR libstdc++/54314 (undefined references to 'construction vtable for...

re PR libstdc++/54314 (undefined references to 'construction vtable for std::ostream-in-std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >')

	PR libstdc++/54314
	* config/i386/winnt.c (i386_pe_assemble_visibility): Don't warn
	about visibility on artificial decls.
	* config/sol2.c (solaris_assemble_visibility): Likewise.

From-SVN: r195723