class.c (vcall_offset_data_s): Add last_init and fns.

class.c (vcall_offset_data_s): Add last_init and fns.

	* class.c (vcall_offset_data_s): Add last_init and fns.
	(overrides): Rename to same_signature_p.
	(dfs_find_final_overrider): Adjust accordingly.
	(mark_overriders): Likewise.
	(warn_hidden): Likewise.
	(build_vtbl_initializer): Reorganize machinery for building things
	at negative offsets.
	(build_vcall_and_vbase_vtbl_entries): Likewise.
	(build_vbase_offset_vtbl_entries): Likewise.
	(dfs_build_vcall_offset_vtbl_entries): Correct order of vcall
	offset entries.  Do not create two entries for functions with the
	same signature.
	(build_vcall_offset_vtbl_entries): Initialize vod->fns.
	(build_rtti_vtbl_entries): Reorganize machinery for building things
	at negative offsets.

From-SVN: r34503