Objective-C, Darwin : Update protocol metadata to current version.

Objective-C, Darwin : Update protocol metadata to current version.

Later versions of the NeXT runtime protocol metadata contain additional
fields.  This patch adds these fields and populates a new list of
method types.

gcc/objc/ChangeLog:

	* objc-next-runtime-abi-02.c (build_v2_super_template): Add new
	fields to the template.
	(build_v2_protocol_template): Build new field entries.
	(generate_v2_meth_descriptor_table): Adjust to allow recording all
	method types.
	(generate_v2_meth_type_list): New.
	(build_v2_protocol_initializer): Initialize the additional fields.
	(generate_v2_protocols): Record method types for all entries and
	generate the additional method type table.