Implement opaque-enum-specifiers for C++0x.

	Implement opaque-enum-specifiers for C++0x.
gcc/
	* tree.h (ENUM_IS_OPAQUE): New.
	* dwarf2out.c (gen_enumeration_type_die): Use ENUM_IS_OPAQUE.
gcc/cp/
	* cp-tree.h (SET_OPAQUE_ENUM_P): New.
	(OPAQUE_ENUM_P): New.
	(ENUM_FIXED_UNDERLYING_TYPE_P): New.
	(start_enum): Update prototype.
	(finish_enum_value_list): New prototype.
	* parser.c (cp_parser_elaborated_type_specifier): Issue a pedwarn if
	"enum class" is used in an elaborated-type-specifier.
	(cp_parser_enum_specifier): Rewrite to parse opaque-enum-specifiers.
	* decl.c (copy_type_enum): New.
	(finish_enum_value_list): New, with code from finish_enum.
	(finish_enum): A lot of code removed. Added a gcc_assert.
	(start_enum): Add parameters enumtype and is_new.
	Rewrite to work with opaque-enum-specifiers.
	* pt.c (maybe_process_partial_specialization): Allow for template
	specialization of enumerations, with a pedwarn.
	(lookup_template_class): Update call to start_enum. Call to
	SET_OPAQUE_ENUM_P.
	(tsubst_enum): Call to begin_scope, finish_scope and
	finish_enum_value_list.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@165935 138bc75d-0d04-0410-961f-82ee72b054a4