re PR c++/18464 (error message about "non-lvalue in unary '&'" when using ?: operator)

	PR c++/18464
	* call.c (build_this): In templates, do not bother with
	build_unary_op.
	* typeck.c (unary_complex_lvalue): In a template, always refuse
	simplifications.

	PR c++/18492
	* cp-gimplify.c (cp_genericize): Relax assertion.

	PR c++/11224
	* cvt.c (convert_to_void): Warn about unused values.

	PR c++/18257
	* rtti.c (emit_support_tinfos): On systems without weak symbols,
	emit the runtime library type-info objects as non-COMDAT.

	PR c++/18464
	* g++.dg/template/cond5.C: New test.

	PR c++/18492
	* g++.dg/inherit/thunk3.C: New test.

	PR c++/11224
	* g++.dg/warn/Wunused-9.C: New test.

From-SVN: r92491