re PR c++/9737 ([DR150] Partial template specialisation selection failure involving template parameter defaults)

	PR c++/9737
	* pt.c (coerce_template_template_parms): Do not templates with
	excess default arguments to match template template parameters
	with fewer parameters.
	(coerce_template_parms): Add use_default_args parameter; use
	default arguments only when true.
	(lookup_template_class): Adjust call to coerce_template_parms.
	(fn_type_unification): Likewise.
	(unify): Likewise.
	(get_bindings): Likewise.
	(dependent_type_p): Add assertions.

	PR c++/9737
	* g++.dg/template/ttp15.C: New test.
	* g++.dg/template/ttp16.C: Likewise.
	* g++.dg/template/ttp17.C: Likewise.
	* g++.old-deja/g++.pt/ttp36.C: Remove.
	* g++.old-deja/g++.pt/ttp19.C: Likewise.
	* g++.old-deja/g++.pt/ttp37.C: Likewise.
	* g++.old-deja/g++.pt/ttp38.C: Likewise.
	* g++.old-deja/g++.pt/ttp39.C: Likewise.
	* g++.old-deja/g++.pt/ttp9.C: Likewise.
	* g++.old-deja/g++.pt/ttp40.C: Likewise.
	* g++.old-deja/g++.pt/ttp51.C: Likewise.
	* g++.old-deja/g++.pt/ttp26.C: Likewise.
	* g++.old-deja/g++.pt/ttp36.C: Likewise.

	* testsuite/testsuite_tr1.h (test_property): New function.
	* testsuite/tr1/4_metaprogramming/type_properties/extent/extent.cc 
	(test01)

From-SVN: r110693