* cp-tree.def (THUNK_DECL): Discuss vcall indices.
	* cp-tree.h (BINFO_VIRTUALS): Update documentation.
	(BF_DELTA): New macro.
	(BF_VCALL_INDEX): Likewise.
	(BF_FN): Likewise.
	(THUNK_VCALL_OFFSET): Likewise.
	(make_thunk): Change prototype.
	* class.c (build_vtable_entry): Integrate
	build_vtable_entry_for_fn.  Handle vcall indices.
	(build_vtable_entry_for_fn): Remove.
	(set_rtti_entry): Handle vcall indices.  Use BF_DELTA,
	BF_VCALL_INDEX, BF_FN.
	(modify_vtable_entry): Integrate common code from
	modify_one_vtable and dfs_fixup_vtable_deltas.
	(add_virtual_function): Set BF_VCALL_INDEX.
	(build_vtbl_initializer): Simplify.  Use BF_DELTA, BF_VCALL_INDEX,
	and BF_FN.
	(modify_one_vtable): Simplify.
	(dfs_fixup_vtable_deltas): Likewise.
	(override_one_vtable): Use BF_DELTA, BF_VCALL_INDEX, BF_FN.
	* method.c (make_thunk): Handle vcall indices.

From-SVN: r31684