Class template argument deduction in new-expression
	* init.c (build_new): Handle deduction from no initializer.
	* parser.c (cp_parser_new_expression): Don't require a single
	expression for class template deduction.
	* typeck2.c (cxx_incomplete_type_diagnostic): Fix diagnostic for
	class template placeholder.
	* pt.c (tsubst_copy) [TEMPLATE_DECL]: Handle dependent context.
	(tsubst_copy_and_build) [TEMPLATE_ID_EXPR]: Handle SCOPE_REF.
	(redeclare_class_template): Set TEMPLATE_TYPE_PARM_FOR_CLASS.

From-SVN: r245826