The 3.0 ABI no longer has vbase pointer fields.

The 3.0 ABI no longer has vbase pointer fields.

cp:
	The 3.0 ABI no longer has vbase pointer fields.
	* cp-tree.h (VBASE_NAME, VBASE_NAME_FORMAT, VBASE_NAME_P,
	FORMAT_VBASE_NAME): Remove.
	* method.c (do_build_copy_constructor): Adjust.
	(do_build_assign_ref): Adjust.
	* search.c (lookup_field_r): Adjust.
	* typeck.c (build_component_ref): Adjust.

	The 3.0 ABI always has a vtable pointer at the start of every
	polymorphic class.
	* rtti.c (build_headof_sub): Remove.
	(build_headof): Adjust.
	(get_tinfo_decl_dynamic): No need to check flag_rtti
	here. Adjust.
	(create_real_tinfo_var): Explain why we need a hidden name.

From-SVN: r44515