re PR c++/9128 (Typeid does not work on polymorphic classes)

re PR c++/9128 (Typeid does not work on polymorphic classes)

	PR c++/9128
	* g++.dg/rtti/typeid1.C: New file.

	PR c++/9153
	* g++.dg/parse/lookup1.C: New file.

	PR c++/9171
	* g++.dg/templ/spec5.C: New file.

	* cp-tree.h (reparse_absdcl_as_expr): Remove.
	(reparse_absdcl_as_casts): Likewise.
	(reparse_decl_as_expr): Likewise.
	(finish_decl_parsing): Likewise.
	* decl2.c (reparse_absdcl_as_expr): Remove.
	(reparse_absdcl_as_casts): Likewise.
	(repase_decl_as_expr): Likewise.
	(finish_decl_parsing): Likewise.

	PR c++/9128
	PR c++/9153
	PR c++/9171
	* parser.c (cp_parser_pre_parsed_nested_name_specifier): New
	function.
	(cp_parser_nested_name_specifier_opt): Correct the
	check_dependency_p false.
	(cp_parser_postfix_expression): Fix formatting.
	(cp_parser_decl_specifier_seq): Avoid looking for constructor
	declarators when possible.
	(cp_parser_template_id): Avoid performing name-lookup when
	possible.
	(cp_parser_class_head): Do not count specializations when counting
	levels of templates.
	(cp_parser_constructor_declarator_p): Return immediately if
	there's no chance that the tokens form a constructor declarator.
	* rtti.c (throw_bad_typeid): Add comment.  Do not return an
	expression with reference type.
	(get_tinfo_decl_dynamic): Do not return an expression with
	reference type.
	(build_typeid): Add comment.  Do not return an expression with
	reference type.
	* typeck.c (build_class_member_access_expr): Improve handling of
	conditionals and comma-expressions as objects.

From-SVN: r61166